Pen Settings

HTML

About HTML Preprocessors

HTML preprocessors can make writing HTML more powerful or convenient. For instance, Markdown is designed to be easier to write and read for text documents and you could write a loop in Pug.

Learn more · Versions

Adding Classes

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. So you don't have access to higher-up elements like the <html> tag. If you want to add classes there that can affect the whole document, this is the place to do it.

About the <head>

In CodePen, whatever you write in the HTML editor is what goes within the <body> tags in a basic HTML5 template. If you need things in the <head> of the document, put that code here.

!
Insecure Resource

The resource you are linking to is using the 'http' protocol, which may not work when the browser is using https.

CSS

About CSS Preprocessors

CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

Learn more · Versions

CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

Vendor Prefixing

About Vendor Prefixing

To get the best cross-browser support, it is a common practice to apply vendor prefixes to CSS properties and values that require them to work. For instance -webkit- or -moz-.

We offer two popular choices: Autoprefixer (which processes your CSS server-side) and -prefix-free (which applies prefixes via a script, client-side).

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

Powered by Algolia
About External Resources

You can apply CSS to your Pen from any stylesheet on the web. Just put a URL to it here and we'll apply it, in the order you have them, before the CSS in the Pen itself.

You can also link to another Pen here (use the .css URL Extension) and we'll pull the CSS from that Pen and include it. If it's using a matching preprocessor, use the appropriate URL Extension and we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

Learn more

+ add another resource

JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

Learn more · Versions

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

Powered by Algolia
About External Resources

You can apply a script from anywhere on the web to your Pen. Just put a URL to it here and we'll add it, in the order you have them, before the JavaScript in the Pen itself.

If the script you link to has the file extension of a preprocessor, we'll attempt to process it before applying.

You can also link to another Pen here, and we'll pull the JavaScript from that Pen and include it. If it's using a matching preprocessor, we'll combine the code before preprocessing, so you can use the linked Pen as a true dependency.

Learn more

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Powered by Algolia
About Packages

Using packages here is powered by esm.sh, which makes packages from npm not only available on a CDN, but prepares them for native JavaScript ESM usage.

All packages are different, so refer to their docs for how they work.

If you're using React / ReactDOM, make sure to turn on Babel for the JSX processing.

Behavior

Auto Save

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML 

              
                %body
  %header#first
    .header-content
      .inner
        %h1 What's New in Bootstrap
        %h5.wow.fadeIn.text-normal.wow.fadeIn A free, one-page theme to highlight the new features
        %a.btn.btn-primary-outline.btn-xl.page-scroll.wow.fadeInUp.m-t-3{:href => "#one"} Get Started
  %nav#topNav.navbar.fixed-top.navbar-toggleable-sm
    .container
      %button.navbar-toggler{"data-target" => "#collapsingNavbar", "data-toggle" => "collapse", :type => "button"}
        %span ☰
      %a.navbar-brand.page-scroll{:href => "#first"} Bootstrap 4
      #collapsingNavbar.collapse.navbar-collapse
        %ul.navbar-nav
          %li.nav-item
            %a.nav-link.page-scroll{:href => "#one"} Cards
          %li.nav-item
            %a.nav-link.page-scroll{:href => "#two"} Flexbox
          %li.nav-item
            %a.nav-link.page-scroll{:href => "#examples"} Examples
          %li.nav-item
            %a.nav-link.page-scroll{:href => "#three"} 5 Tiers
          %li.nav-item
            %a.nav-link.page-scroll{:href => "#four"} More
        %ul.nav.navbar-nav.ml-auto
          %li.nav-item
            %a.nav-link.page-scroll{"data-toggle" => "modal", :href => "#aboutModal", :title => "A free Bootstrap theme"} About
  %section#one
    .container.wow.fadeInUp
      %h2 Cards
      %p.lead
        What you notice first in
        %a{:href => "https://v4-alpha.getbootstrap.com/"} Bootstrap 4
        is that
        %code .panel
        and
        %code .well
        have been replaced by the
        = succeed "." do
          %code .card
        %a{:href => ""} Bootstrap 4 Cards
        can be singular, grouped together (as shown) or
        = succeed "." do
          %a{:href => ""} equal height
      .card-group
        / card
        .card
          %img.card-img-top.img-fluid{:alt => "Card image cap", :src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample13.jpg"}/
          .card-block
            %h4.card-title Consise
            %p.card-text Cards are a good way to display content composed of different types of objects. They’re well-suited for presenting similar objects whose size or supported actions vary, like headings and photos with captions.
        / card
        .card
          %img.card-img-top.img-fluid{:alt => "Card image cap", :src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample19.jpg"}/
          .card-block
            %h4.card-title Grouped
            %p.card-text
              Use card groups to render equal height cards without gutters between the cards. Use
              %code .card-deck
              for cards that aren’t attached to each another.
        / card
        .card
          %img.card-img-top.img-fluid{:alt => "Card image cap", :src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample14.jpg"}/
          .card-block
            %h4.card-title Same Height
            %p.card-text A frequent problem occurs when you have multiple items in a row with content of varying height. Thanks to flexbox (and display:table) we now have equal height cards!
  %section#two.bg-alt
    .container
      .row
        .col-lg-12.text-center
          %h2.mt-0.text-primary Flexbox
          %hr.primary/
    .container.wow.fadeInUp
      .row
        .col-lg-4.col-md-4.text-center
          .feature
            %i.icon-lg.ion-ios-grid-view-outline.wow.fadeIn{"data-wow-delay" => ".1s"}
            %h6.text-uppercase Easier
            %p.text-muted.m-b-0
              Flexbox provides
              %a{:href => "https://v4-alpha.getbootstrap.com/getting-started/flexbox"} simpler, more flexible layout
              options like vertical centering.
        .col-lg-4.col-md-4.text-center
          .feature
            %i.icon-lg.ion-social-sass.wow.fadeInUp
            %h6.text-uppercase Sass-y
            %p.text-muted.m-b-0 Use SASS to easily customize your Bootstrap 4 projects.
        .col-lg-4.col-md-4.text-center
          .feature
            %i.icon-lg.ion-social-css3-outline.wow.fadeIn{"data-wow-delay" => ".1s"}
            %h6.text-uppercase It's Modern
            %p.text-muted.m-b-0
              Introduced in CSS3, flexbox won't work in older browsers like
              = succeed "." do
                %a{:href => "http://caniuse.com/#feat=flexbox"} IE9
  %section#examples
    .container.text-center
      .row
        .col-lg-10.offset-lg-1.col-12.text-center
          %h1.mt-0.text-primary Bootstrap 4 Examples
          %hr.primary/
        .col-sm-6.text-center
          %h5.mt-0.text-primary Layouts &amp; Templates
          .nav.flex-column.text-center
            %a.nav-link{:href => "//www.codeply.com/go/wECEBeWpLO/bootstrap-4-sticky-footer-flexbox"} Sticky Footer
            %a.nav-link{:href => "//www.codeply.com/go/KrUO8QpyXP/bootstrap-4-dashboard"} Dashboard
            %a.nav-link{:href => "//www.codeply.com/go/i8xuvOmVw3/bootstrap-4-full-height-jumbotron-vertical-center"} Full-height Jumbotron Vertical Center
            %a.nav-link{:href => "//www.codeply.com/go/i8xuvOmVw3/bootstrap-4-affix-nav-and-sidebar-layout"} Header, Affix Navbar &amp; Sidebar
            %a.nav-link{:href => "//www.codeply.com/go/JbaVzJCNLJ/bootstrap-4-off-canvas-sidebar"} Off-canvas Sidebar
        .col-sm-6.text-center
          %h5.mt-0.text-primary Code Snippets
          .nav.flex-column.text-center
            %a.nav-link{:href => "//www.codeply.com/go/kTGlK9Axdk/bootstrap-4-navbar-align-center"} Navbar Align Center
            %a.nav-link{:href => "//www.codeply.com/go/kTGlK9Axdk/bootstrap-4-navbar-align-right"} Navbar Align Right
            %a.nav-link{:href => "//www.codeply.com/go/1ZFF5CEXM5/bootstrap-4-custom-navbar-color"} Custom Navbar Color
            %a.nav-link{:href => "//www.codeply.com/go/q0b6ILuRyx/bootstrap-4-vertical-sidebar-nav-with-submenu"} Multi-level Vertical Side Nav
            %a.nav-link{:href => "//www.codeply.com/go/C3ZSBLzAZC/bootstrap-4-card-examples"} Card Examples
  %section#three
    .container-fluid
      %h5.text-primary.text-center.text-uppercase Now there are 5 Breakpoints
      %p.text-center
        %small To accomodate a variety of devices and screen widths
      .row
        .col-sm-10.offset-sm-1.col-12.offset-0
          .row
            .col-md-2.offset-md-1.offset-sm-0
              .card-block.text-center
                %h1.card-title XS
                %h3.text-muted &lt;34 em
                %hr.primary.hidden-sm-up/
            .col-md-2
              .card-block.text-center
                %h1.card-title SM
                %h3.text-muted ≥34 em
                %hr.primary.hidden-md-up/
            .col-md-2
              .card-block.text-center
                %h1.card-title MD
                %h3.text-muted ≥48 em
                %hr.primary.hidden-lg-up/
            .col-md-2
              .card-block.text-center
                %h1.card-title LG
                %h3.text-muted ≥62 em
                %hr.primary.hidden-xl-up/
            .col-md-2
              .card-block.text-center
                %h1.card-title XL
                %h3.text-muted ≥75 em
                %hr.primary/
      .row
        .col-10.offset-1
          .row
            .col-xl-2.col-lg-3.col-md-4.col-sm-6.text-center
              .card
                %img.img-fluid{:src => "//s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample14.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample3.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
            .col-xl-2.col-lg-3.col-md-4.col-sm-6.text-center
              .card
                %img.img-fluid{:src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample20.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample3.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
            .col-xl-2.col-lg-3.col-md-4.col-sm-6.text-center
              .card.card-inverse
                %img.img-fluid{:src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample22.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample3.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
            .col-xl-2.col-lg-3.col-md-4.col-sm-6.text-center
              .card
                %img.img-fluid{:src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample15.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample3.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
            .col-xl-2.col-lg-3.col-md-4.col-sm-6.text-center
              .card
                %img.img-fluid{:src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample35.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample35.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
            .col-xl-2.col-lg-3.col-md-4.col-sm-6.text-center
              .card
                %img.img-fluid{:src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample16.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample16.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
            .col-xl-2.col-lg-3.col-md-4.col-sm-6.text-center
              .card
                %img.card-img.img-fluid{:src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample13.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample13.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
            .col-xl-2.col-lg-3.col-md-4.col-sm-6.text-center
              .card
                %img.img-fluid{:src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample11.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample11.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
            .col-xl-2.col-lg-3.col-md-4.col-sm-6.text-center
              .card
                %img.img-fluid{:src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample23.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample3.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
            .col-xl-2.col-lg-3.col-md-4.col-sm-6.text-center
              .card
                %img.card-img.img-fluid{:src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample9.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample9.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
            .col-xl-2.col-lg-3.col-md-4.col-sm-6.text-center
              .card
                %img.img-fluid{:src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample5.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample5.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
            .col-xl-2.col-lg-3.col-md-4.col-sm-6.text-center
              .card
                %img.img-fluid{:src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample4.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample4.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
            .col-xl-3.col-lg-3.col-md-4.col-sm-6.text-center
              .card
                %img.card-img.img-fluid{:src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample3.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample3.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
            .col-xl-3.col-lg-3.col-md-4.col-sm-6.text-center
              .card
                %img.img-fluid{:src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample2.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample2.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
            .col-xl-3.col-lg-3.col-md-4.col-sm-6.text-center
              .card
                %img.img-fluid{:src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample7.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample7.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
            .col-xl-3.offset-xl-0.col-lg-3.offset-lg-0.col-md-4.offset-md-4.col-sm-6.text-center
              .card.m-x-auto
                %img.img-fluid{:src => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample21.jpg"}/
                .card-img-overlay
                  %h4.card-title.text-center
                    %a.text-light{"data-src" => "https://s3-us-west-2.amazonaws.com/s.cdpn.io/331810/sample21.jpg", "data-toggle" => "modal", :href => "#galleryModal"} view
    %br/
  %aside.bg-alt
    .container.text-center
      %h2.text-primary.text-center The Grid is More Flexible
      %hr.primary/
      %br/
      .row.wow.fadeInUp
        .col-md-3.col-sm-6.col-12.text-center
          %h3 Start
          %i.icon-lg.ion-ios-speedometer-outline.wow.pulse
          %h1.text-primary 100
        .col-md-3.col-sm-6.col-12.text-center
          %h3 Migrate
          %i.icon-lg.ion-ios-location-outline.wow.pulse
          %h1.text-primary 3421
        .col-md-3.col-sm-6.col-12.text-center
          %h3 Build
          %i.icon-lg.ion-ios-pulse.wow.pulse
          %h1.text-primary 4%
        .col-md-3.col-sm-6.col-12.text-center
          %h3 Play
          %i.icon-lg.ion-ios-game-controller-b-outline.wow.pulse
          %h1.text-primary 50%
      %hr/
      %br/
    .container
      .row
        .col-sm-6
          6
        .col-sm-6.text-normal
          .card.bg-primary 6 units
        .col-sm-5
          5
        .col-sm-7.text-normal
          .card.bg-primary 7 units
        .col-sm-4
          4
        .col-sm-8.text-normal
          .card.bg-primary 8 units
        .col-sm-3
          3
        .col-sm-9.text-normal
          .card.bg-primary 9 units
        .col-sm-2
          2
        .col-sm-10.text-normal
          .card.bg-primary 10 units
        .col-sm-1
          1
        .col-sm-11.text-normal
          .card.bg-primary 11 units
    %hr/
    .container
      .row
        .col-lg-2.text-normal
          .card.bg-primary 2
        .col-lg-10
        .col-lg-4.text-normal
          .card.bg-primary 4
        .col-lg-8
        .col-lg-6.text-normal
          .card.bg-primary 6
        .col-lg-6
        .col-lg-8.text-normal
          .card.bg-primary 8
        .col-lg-4
        .col-lg-10.text-normal
          .card.bg-primary 10
        .col-lg-2
        .col-lg-12.text-normal
          .card.bg-primary 12
  %section#four
    .container
      .row
        .col-12.col-lg-6
          %h2.text-nowrap Fonts got larger
        .col-12.col-lg-6.text-right
          %button.btn.btn-lg.text-normal.btn-outline-secondary Outline
          %button.btn.btn-lg.text-normal.btn-outline-primary Buttons
          %button.btn.btn-lg.text-normal.btn-outline-danger Are Here
        .col-12
          %br/
          %h1.display-4 Wow.
          %p.lead.text-justify Text is larger in Bootstrap 4. The default font size is now 16px. There are also new "Display headings" that really stand out. The new em based sizing is cool too.
      %hr/
      .row
        .col-md-6.col-12.text-center
          %nav.navbar.navbar-inverse.bg-inverse.navbar-toggleable.text-normal.rounded
            %ul.navbar-nav
              %li.nav-item.active
                %a.nav-link{:href => "#"} Home
              %li.nav-item
                %a.nav-link{:href => "#"} Features
              %li.nav-item
                %a.nav-link{:href => "#"} Pricing
              %li.nav-item
                %a.nav-link{:href => "#"} About
        .col-md-6.col-12
          %h2 Navbar
          %p.text-justify
            The new Bootstrap 4
            %code .navbar
            code is lighter. You can make it responsive using the Collapse component and
            %code .navbar-toggleable-*
            classes that enable you to control the breakpoint.
        .col-12.clearfix
          %hr/
        .col-md-6.col-12
          %h2 RIP icons, affix, etc..
          %p.text-justify
            Some components have been removed from Bootstrap 4. The Glyphicons icon fonts are no longer included, but it's easy to
            utilize another font like FontAwesome,
            %a{:href => "https://octicons.github.com/"} Octicons
            or
            = succeed "." do
              %a{:href => "http://ionicons.com/"} Ionicons
        .col-md-6.col-12.text-center
          .row
            .col-lg-3.col-md-3.col-6.text-center
              %a{"data-target" => "#alertModal", "data-toggle" => "modal", :href => "#alertModal"}
                %i.icon-lg.ion-ios-cloud--outline.wow.fadeIn
            .col-lg-3.col-md-3.col-6.text-center
              %i.icon-lg.ion-ios-pie-outline.wow.fadeIn.text-primary
            .col-lg-3.col-md-3.col-6.text-center
              %i.icon-lg.ion-ios-star-outline.wow.fadeIn.text-primary
            .col-lg-3.col-md-3.col-6.text-center
              %i.icon-lg.ion-ios-heart-outline.wow.fadeIn.text-primary
            .col-lg-3.col-md-3.col-6.text-center
              %i.icon-lg.ion-ios-pulse.wow.fadeIn.text-primary
            .col-lg-3.col-md-3.col-6.text-center
              %i.icon-lg.ion-ios-refresh-outline.wow.fadeIn.text-primary
            .col-lg-3.col-md-3.col-6.text-center
              %i.icon-lg.ion-ios-gear-outline.wow.fadeIn.text-primary
            .col-lg-3.col-md-3.col-6.text-center
              %i.icon-lg.ion-ios-timer-outline.wow.fadeIn.text-primary
        .col-12.clearfix
          %hr/
        .col-md-6.col-12
          .card.text-normal
            .card-block
              %ul.list-unstyled
                %li.text-capitalize
                  %code.text-lowercase text-capitalize
                  Capitalize each word
                %li.text-uppercase
                  %code.text-lowercase text-uppercase
                  Uppercase text
                %li.text-lowercase
                  %code text-lowercase
                  There is lowercase too
                %li.text-truncate
                  %code text-truncate
                  some longer text that won't wrap and will truncate with ellipsis at the end.
              %h6 Migration tips
              %ul.list-unstyled
                %li
                  %code well
                  \=
                  %code card card-block
                %li
                  %code panel panel-default
                  \=
                  %code card
                %li
                  %code pull-right
                  \=
                  %code float-right
                %li
                  %code img-responsive
                  \=
                  %code img-fluid
                %li
                  %code list-inline &gt; li
                  \=
                  %code list-inline-item
                %li
                  add
                  %code nav-item
                  to nav navbar &gt; li
                %li
                  add
                  %code nav-link
                  to nav navbar &gt; li &gt; a
                %li
                  the
                  %code active
                  class is added to
                  %code nav-item
                  for scrollspy
                %li
                  %code carousel-inner &gt; item
                  \=
                  %code carousel-item
                %li
                  %code table-condensed
                  \=
                  %code table-sm
                %li
                  %code input-lg
                  \=
                  %code form-control-lg
                %li
                  %code input-sm
                  \=
                  %code form-control-sm
              Here's a handy
              %a{:href => "http://upgrade-bootstrap.bootply.com/"} Bootstrap 3 to 4 upgrade tool
              to convert your code!
        .col-md-6.col-12
          %h2 Handy utilities
          %p.text-justify
            Several simple, but useful
            %a{:href => "https://v4-alpha.getbootstrap.com/components/utilities"} utility classes
            have been added like text, margin and padding helpers. There are
            also
            %a{:href => "https://v4-alpha.getbootstrap.com/components/utilities/#contextual-colors-and-backgrounds"} contextual colors
            and
            %a{:href => "https://v4-alpha.getbootstrap.com/layout/responsive-utilities/"} responsive utility
            classes to hide content on
            specific breakpoints. There's even a new fluid Jumbotron!
  %aside.bg-alt
    .container.text-center
      .call-to-action
        %h2.text-primary Get Started
        %a.btn.btn-primary-outline.btn-lg.wow.flipInX.text-uppercase{:href => "http://bootstrap4.guide", :target => "ext"} Free
      %br/
      %hr/
      %br/
      .row
        .col-lg-10.offset-lg-1
          %h6.wide-space.text-center.text-uppercase Bootstrap is Built on these Standards
          .row
            .col-sm-3.col-6.text-center
              %i.icon-lg.ion-social-html5-outline{:title => "html 5"}
            .col-sm-3.col-6.text-center
              %i.icon-lg.ion-social-sass{:title => "sass"}
            .col-sm-3.col-6.text-center
              %i.icon-lg.ion-social-javascript-outline{:title => "javascript"}
            .col-sm-3.col-6.text-center
              %i.icon-lg.ion-social-css3-outline{:title => "css 3"}
  %section#last
    .container
      .row
        .col-lg-8.offset-lg-2.text-center
          %h2.margin-top-0.wow.fadeIn Get in Touch
          %hr.primary/
          %p We love feedback. Fill out the form below and we'll get back to you as soon as possible.
        .col-lg-10.offset-lg-1.text-center
          %form.contact-form.row
            .col-md-4
              %label
              %input.form-control{:placeholder => "Name", :type => "text"}/
            .col-md-4
              %label
              %input.form-control{:placeholder => "Email", :type => "text"}/
            .col-md-4
              %label
              %input.form-control{:placeholder => "Phone", :type => "text"}/
            .col-md-12
              %label
              %textarea.form-control{:placeholder => "Your message here..", :rows => "9"}
            .col-md-4.offset-md-4
              %label
              %button.btn.btn-primary.btn-block.btn-lg{"data-target" => "#alertModal", "data-toggle" => "modal", :type => "button"}
                Send
                %i.ion-android-arrow-forward
  %footer#footer
    .container
      .row
        .col-6.col-sm-3
          %h6.text-uppercase Bootstrap 4
          %ul.list-unstyled
            %li
              %a{:href => "https://medium.com/@bootply/bootstrap-4-whats-new-visual-guide-c84dd81d8387", :target => "ext"} What's New
            %li
              %a{:href => "http://codeply.com/tagged/bootstrap-4", :target => "ext"} Examples
            %li
              %a{:href => "https://getbootstrap.com", :target => "ext"} Official
            %li
              %a{:href => "http://www.codeply.com/go/p/bootstrap_4.0.alpha", :target => "ext"} Playground
        .col-6.col-sm-3.column
          %h6.text-uppercase About
          %ul.list-unstyled
            %li
              %a{:href => "#"} Contact Us
            %li
              %a{:href => "#"} Delivery Information
            %li
              %a{:href => "#"} Privacy Policy
            %li
              %a{:href => "#"} Terms &amp; Conditions
        .col-12.col-sm-3.column
          %h6.text-uppercase Stay Posted
          %form
            .form-group
              %input.form-control{:placeholder => "Tell us your email", :title => "No spam, we promise!", :type => "text"}/
            .form-group
              %button.btn.btn-primary{"data-target" => "#alertModal", "data-toggle" => "modal", :type => "button"} Subscribe for updates
        .col-12.col-sm-3.text-right
          %h6.text-uppercase Follow
          %ul.list-inline
            %li.list-inline-item
              %a{:href => "", :rel => "nofollow", :title => "Twitter"}>
                %i.icon-lg.ion-social-twitter-outline
               
            %li.list-inline-item
              %a{:href => "", :rel => "nofollow", :title => "Facebook"}
                %i.icon-lg.ion-social-facebook-outline
      %br/
      %span.float-right.text-muted.small
        %a{:href => "http://bootstrap4.guide"} Made by Themes.guide
        ©2015-2017 Company
  #galleryModal.modal.fade{"aria-hidden" => "true", :role => "dialog", :tabindex => "-1"}
    .modal-dialog
      .modal-content
        .modal-body.text-center
          %img#galleryImage.center-block.img-fluid{:src => "//placehold.it/1200x700/222?text=..."}/
          %p
            %br/
            %button.btn.btn-primary.btn-lg{"aria-hidden" => "true", "data-dismiss" => "modal"}
              Close
              %i.ion-android-close
  #aboutModal.modal.fade{"aria-hidden" => "true", :role => "dialog", :tabindex => "-1"}
    .modal-dialog
      .modal-content
        .modal-body.text-center
          %h2.text-center Bootstrap 4 Theme
          %h6.text-center A free, responsive template
          %p.text-center
            This is a customized, single page example template that demonstrates some of the new features to check out in Bootstrap 4. Some of the features include Google Montserrat fonts, animation using Dan Eden's animate.css and the WOW jQuery plugin to watch the scrolling.
          %p.text-center
            %a{:href => "http://bootstrap4.guide"} Descargar at Bootstrap4.guide
          %br/
          %button.btn.btn-primary.btn-lg{"aria-hidden" => "true", "data-dismiss" => "modal"} OK
  #alertModal.modal.fade{"aria-hidden" => "true", :role => "dialog", :tabindex => "-1"}
    .modal-dialog.modal-sm
      .modal-content
        .modal-body.text-center
          %h2.text-center Nice Job!
          %p.text-center You clicked the button, but it doesn't actually go anywhere because this is only a demo.
          %p.text-center
            %a{:href => "https://medium.com/@bootply/bootstrap-4-whats-new-visual-guide-c84dd81d8387"} Learn More
          %br/
          %button.btn.btn-primary.btn-lg{"aria-hidden" => "true", "data-dismiss" => "modal"}
            OK
            %i.ion-android-close
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Montserrat:700);
html,
body {
  width: 100%;
  height: 100%;
}

body {
  font-family: 'Montserrat', 'Helvetica Neue', Arial, sans-serif;
  color: #001A33;
  webkit-tap-highlight-color: #222;
  top: 0;
}


/* workaround modal-open padding issue */

body.modal-open {
  padding-right: 0 !important;
}

hr {
  max-width: 120px;
  border-width: 3px;
  opacity: 0.08;
  margin-top: 25px;
  margin-bottom: 25px;
}

hr.light {
  border-color: #fff;
  opacity: 1;
}

hr.primary {
  border-color: #007FFF;
  opacity: 1;
}

a {
  color: #007FFF;
  -webkit-transition: all .35s;
  -moz-transition: all .35s;
  transition: all .35s;
}

a:hover,
a:focus {
  color: #222;
  outline: 0;
}

p {
  font-size: 17px;
  line-height: 1.7;
  margin-bottom: 20px;
  font-family: 'Helvetica Neue', Arial, sans-serif;
}

.text-normal {
  font-family: 'Helvetica Neue', Arial, sans-serif;
}

.wide-space {
  letter-spacing: 1.6px;
}

.icon-lg {
  font-size: 50px;
  line-height: 18px;
}

.bg-primary {
  background-color: #007FFF;
}

.bg-alt {
  background-color: #fff;
}

.text-faded {
  color: rgba(245, 245, 245, 0.7);
}

.text-dark {
  color: #001A33;
}

.text-light {
  color: #fff;
}

.text-light:hover,
.text-light:focus {
  color: #eee;
  text-decoration: none;
}

.text-primary {
  color: #007FFF;
}

section {
  padding: 70px 0;
}

aside {
  padding: 45px 0;
}

footer {
  padding: 45px;
  padding-top: 40px;
  background-color: #e0e0e3;
}

footer h4,
footer h6 {
  color: #fff;
}

.navbar {
  border-color: rgba(35, 35, 35, .05);
  background-color: #fff;
  -webkit-transition: all .4s;
  -moz-transition: all .4s;
  transition: all .4s;
}

.navbar-brand {
  color: #007FFF;
  padding: 1px;
  line-height: 1.90em;
  -webkit-transition: padding .2s ease-in;
  -moz-transition: padding .2s ease-in;
  transition: padding .2s ease-in;
  float: none;
}

.navbar-brand:hover,
.navbar-brand:focus {
  color: #007FFF;
}

.navbar .navbar-toggle:focus,
.navbar-default .navbar-toggle:hover {
  background-color: #001A33;
}

.navbar .navbar-toggle,
.navbar-default .navbar-collapse {
  border-color: transparent;
}

.navbar .navbar-nav > li>a,
.navbar .navbar-nav>li>a:focus {
  font-size: 12px;
  color: #001A33;
  text-transform: uppercase;
}

.navbar .navbar-nav>li>a:hover,
.navbar .navbar-nav>li>a:focus:hover {
  color: #007FFF;
}

.navbar .navbar-nav .nav-link.active,
.navbar .navbar-nav .nav-link.active:focus {
  color: #007FFF !important;
  background-color: transparent;
}


/* responsive nav */

@media(max-width:48em) {
  .navbar .navbar-nav>.nav-item {
    float: none;
    margin-left: .1rem;
  }
  .navbar .navbar-nav {
    float: none !important;
  }
}

@media(min-width:48em) {
  .navbar {
    border-color: transparent;
    background-color: #fff;
    min-height: 60px;
  }
  .navbar-brand {
    color: #007FFF;
    float: left;
    padding-left: 1px;
  }
  .navbar .navbar-brand:hover,
  .navbar .navbar-brand:focus {
    color: #001A33;
  }
  .navbar .navbar-nav > li > a,
  .navbar .navbar-nav> li > a:focus {
    color: #001A33;
    letter-spacing: 1.1px;
  }
  .navbar .navbar-nav > li > a:hover,
  .navbar .navbar-nav > li > a:focus:hover {
    color: #001A33;
  }
  #topNav {
    background-color: #fff;
  }
}

header {
  position: relative;
  min-height: auto;
  text-align: center;
  color: #001A33;
  width: 100%;
  background-color: #fff;
}

header .header-content {
  position: relative;
  width: 100%;
  padding: 100px 15px;
  text-align: center;
  z-index: 2;
}

header .header-content .inner h1 {
  margin-top: 0;
  margin-bottom: 0;
}

header .header-content .inner p {
  margin-bottom: 50px;
  font-size: 16px;
  font-weight: 300;
  color: #222;
}

@media(min-width:34em) {
  .icon-lg {
    font-size: 80px;
  }
  header {
    min-height: 100%;
  }
  header .header-content {
    position: absolute;
    top: 50%;
    padding: 0 50px;
    -webkit-transform: translateY(-50%);
    -ms-transform: translateY(-50%);
    transform: translateY(-50%);
  }
  header .header-content .inner {
    margin-right: auto;
    margin-left: auto;
    max-width: 1000px;
  }
  header .header-content .inner h1 {
    font-size: 53px;
  }
  header .header-content .inner p {
    margin-right: auto;
    margin-left: auto;
    max-width: 80%;
    font-size: 18px;
  }
  section {
    min-height: 600px;
    padding: 100px 0;
  }
}

.list-group-item,
.card-footer {
  background-color: transparent;
}

textarea {
  resize: none;
}

.call-to-action h2 {
  margin: 0 auto 20px;
}

.btn.btn-primary {
  background-color: transparent;
  border: 1px solid #007FFF;
  -webkit-transition: all .35s;
  -moz-transition: all .35s;
  transition: all .35s;
  color: #007FFF;
}

.btn.btn-primary:hover {
  opacity: 0.7;
}

.btn-primary-outline {
  border-color: #007FFF;
  color: #007FFF;
}

.btn-primary-outline:hover {
  background-color: #007FFF;
}

.btn-xl {
  padding: 15px 30px;
  font-size: 20px;
}

::-moz-selection {
  text-shadow: none;
  color: #fff;
  background: #222;
}

::selection {
  text-shadow: none;
  color: #fff;
  background: #222;
}

img::selection {
  color: #fff;
  background: 0 0;
}

img::-moz-selection {
  color: #fff;
  background: 0 0;
}
!

JS 

              
                (function($) {
    "use strict";

    $('body').scrollspy({
        target: '.fixed-top',
        offset: 60
    });

    new WOW().init();
    
    $('a.page-scroll').bind('click', function(event) {
        var $ele = $(this);
        $('html, body').stop().animate({
            scrollTop: ($($ele.attr('href')).offset().top - 60)
        }, 1450, 'easeInOutExpo');
        event.preventDefault();
    });
    
    $('#collapsingNavbar li a').click(function() {
        /* always close responsive nav after click */
        $('.navbar-toggler:visible').click();
    });

    $('#galleryModal').on('show.bs.modal', function (e) {
       $('#galleryImage').attr("src",$(e.relatedTarget).data("src"));
    });

})(jQuery);
!
999px

Console