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HTML

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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.

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Adding Classes

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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.

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Insecure Resource

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CSS

About CSS Preprocessors

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

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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).

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JavaScript

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

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Babel includes JSX processing.

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HTML 

              
                <div class="blog-masthead">
  <div class="container">
    <nav class="nav blog-nav">
      <a class="nav-link active" href="#">Home</a>
      <a class="nav-link" href="#">New features</a>
      <a class="nav-link" href="#">Press</a>
      <a class="nav-link" href="#">New hires</a>
      <a class="nav-link" href="#">About</a>
    </nav>
  </div>
</div>

<div class="blog-header">
  <div class="container">
    <h1 class="blog-title">Pretty Scroll</h1>
    <p class="lead blog-description">A library to make an element follow you as you scroll</p>
  </div>
</div>

<div class="container js-container">

  <div class="row">

    <div class="col-sm-8 blog-main">

      <div class="blog-post">
        <h2 class="blog-post-title">Sample blog post</h2>
        <p class="blog-post-meta">January 1, 2014 by <a href="#">Mark</a></p>

        <p>This blog post shows a few different types of content that's supported and styled with Bootstrap. Basic typography, images, and code are all supported.</p>
        <hr>
        <p>Cum sociis natoque penatibus et magnis <a href="#">dis parturient montes</a>, nascetur ridiculus mus. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum. Sed posuere consectetur est at lobortis. Cras mattis consectetur purus sit amet fermentum.</p>
        <blockquote>
          <p>Curabitur blandit tempus porttitor. <strong>Nullam quis risus eget urna mollis</strong> ornare vel eu leo. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
        </blockquote>
        <p>Etiam porta <em>sem malesuada magna</em> mollis euismod. Cras mattis consectetur purus sit amet fermentum. Aenean lacinia bibendum nulla sed consectetur.</p>
        <h2>Heading</h2>
        <p>Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.</p>
        <h3>Sub-heading</h3>
        <p>Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.</p>
        <pre><code>Example code block</code></pre>
        <p>Aenean lacinia bibendum nulla sed consectetur. Etiam porta sem malesuada magna mollis euismod. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa.</p>
        <h3>Sub-heading</h3>
        <p>Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Aenean lacinia bibendum nulla sed consectetur. Etiam porta sem malesuada magna mollis euismod. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>
        <ul>
          <li>Praesent commodo cursus magna, vel scelerisque nisl consectetur et.</li>
          <li>Donec id elit non mi porta gravida at eget metus.</li>
          <li>Nulla vitae elit libero, a pharetra augue.</li>
        </ul>
        <p>Donec ullamcorper nulla non metus auctor fringilla. Nulla vitae elit libero, a pharetra augue.</p>
        <ol>
          <li>Vestibulum id ligula porta felis euismod semper.</li>
          <li>Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.</li>
          <li>Maecenas sed diam eget risus varius blandit sit amet non magna.</li>
        </ol>
        <p>Cras mattis consectetur purus sit amet fermentum. Sed posuere consectetur est at lobortis.</p>
      </div><!-- /.blog-post -->

      <div class="blog-post">
        <h2 class="blog-post-title">Another blog post</h2>
        <p class="blog-post-meta">December 23, 2013 by <a href="#">Jacob</a></p>

        <p>Cum sociis natoque penatibus et magnis <a href="#">dis parturient montes</a>, nascetur ridiculus mus. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum. Sed posuere consectetur est at lobortis. Cras mattis consectetur purus sit amet fermentum.</p>
        <blockquote>
          <p>Curabitur blandit tempus porttitor. <strong>Nullam quis risus eget urna mollis</strong> ornare vel eu leo. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
        </blockquote>
        <p>Etiam porta <em>sem malesuada magna</em> mollis euismod. Cras mattis consectetur purus sit amet fermentum. Aenean lacinia bibendum nulla sed consectetur.</p>
        <p>Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.</p>
      </div><!-- /.blog-post -->

      <div class="blog-post">
        <h2 class="blog-post-title">New feature</h2>
        <p class="blog-post-meta">December 14, 2013 by <a href="#">Chris</a></p>

        <p>Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Aenean lacinia bibendum nulla sed consectetur. Etiam porta sem malesuada magna mollis euismod. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>
        <ul>
          <li>Praesent commodo cursus magna, vel scelerisque nisl consectetur et.</li>
          <li>Donec id elit non mi porta gravida at eget metus.</li>
          <li>Nulla vitae elit libero, a pharetra augue.</li>
        </ul>
        <p>Etiam porta <em>sem malesuada magna</em> mollis euismod. Cras mattis consectetur purus sit amet fermentum. Aenean lacinia bibendum nulla sed consectetur.</p>
        <p>Donec ullamcorper nulla non metus auctor fringilla. Nulla vitae elit libero, a pharetra augue.</p>
      </div><!-- /.blog-post -->

      <div class="blog-post">
        <h2 class="blog-post-title">Another blog post</h2>
        <p class="blog-post-meta">December 23, 2013 by <a href="#">Jacob</a></p>

        <p>Cum sociis natoque penatibus et magnis <a href="#">dis parturient montes</a>, nascetur ridiculus mus. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum. Sed posuere consectetur est at lobortis. Cras mattis consectetur purus sit amet fermentum.</p>
        <blockquote>
          <p>Curabitur blandit tempus porttitor. <strong>Nullam quis risus eget urna mollis</strong> ornare vel eu leo. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
        </blockquote>
        <p>Etiam porta <em>sem malesuada magna</em> mollis euismod. Cras mattis consectetur purus sit amet fermentum. Aenean lacinia bibendum nulla sed consectetur.</p>
        <p>Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.</p>
      </div><!-- /.blog-post -->

      <div class="blog-post">
        <h2 class="blog-post-title">Another blog post</h2>
        <p class="blog-post-meta">December 23, 2013 by <a href="#">Jacob</a></p>

        <p>Cum sociis natoque penatibus et magnis <a href="#">dis parturient montes</a>, nascetur ridiculus mus. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum. Sed posuere consectetur est at lobortis. Cras mattis consectetur purus sit amet fermentum.</p>
        <blockquote>
          <p>Curabitur blandit tempus porttitor. <strong>Nullam quis risus eget urna mollis</strong> ornare vel eu leo. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
        </blockquote>
        <p>Etiam porta <em>sem malesuada magna</em> mollis euismod. Cras mattis consectetur purus sit amet fermentum. Aenean lacinia bibendum nulla sed consectetur.</p>
        <p>Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.</p>
      </div><!-- /.blog-post -->


      <div class="blog-post">
        <h2 class="blog-post-title">Another blog post</h2>
        <p class="blog-post-meta">December 23, 2013 by <a href="#">Jacob</a></p>

        <p>Cum sociis natoque penatibus et magnis <a href="#">dis parturient montes</a>, nascetur ridiculus mus. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum. Sed posuere consectetur est at lobortis. Cras mattis consectetur purus sit amet fermentum.</p>
        <blockquote>
          <p>Curabitur blandit tempus porttitor. <strong>Nullam quis risus eget urna mollis</strong> ornare vel eu leo. Nullam id dolor id nibh ultricies vehicula ut id elit.</p>
        </blockquote>
        <p>Etiam porta <em>sem malesuada magna</em> mollis euismod. Cras mattis consectetur purus sit amet fermentum. Aenean lacinia bibendum nulla sed consectetur.</p>
        <p>Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Morbi leo risus, porta ac consectetur ac, vestibulum at eros.</p>
      </div><!-- /.blog-post -->

      <nav class="blog-pagination">
        <a class="btn btn-outline-primary" href="#">Older</a>
        <a class="btn btn-outline-secondary disabled" href="#">Newer</a>
      </nav>

    </div><!-- /.blog-main -->

    <div class="col-sm-3 offset-sm-1">
      <div class="js-sidebar">
        <img src="http://placehold.it/300/428bca/fff?text=Banner 1">
      </div>
    </div>

  </div><!-- /.row -->

</div><!-- /.container -->

<footer class="blog-footer">
  <p>Blog template built for <a href="https://getbootstrap.com">Bootstrap</a> by <a href="https://twitter.com/mdo">@mdo</a>.</p>
  <p>
    <a href="#">Back to top</a>
  </p>
</footer>
!

CSS 

              
                /*
 * Globals
 */

@media (min-width: 48em) {
  html {
    font-size: 18px;
  }
}

body {
  font-family: Georgia, "Times New Roman", Times, serif;
  color: #555;
}

h1, .h1,
h2, .h2,
h3, .h3,
h4, .h4,
h5, .h5,
h6, .h6 {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-weight: normal;
  color: #333;
}


/*
 * Override Bootstrap's default container.
 */

.container {
  max-width: 60rem;
}


/*
 * Masthead for nav
 */

.blog-masthead {
  margin-bottom: 3rem;
  background-color: #428bca;
  -webkit-box-shadow: inset 0 -.1rem .25rem rgba(0,0,0,.1);
          box-shadow: inset 0 -.1rem .25rem rgba(0,0,0,.1);
}

/* Nav links */
.nav-link {
  position: relative;
  padding: 1rem;
  font-weight: 500;
  color: #cdddeb;
}
.nav-link:hover,
.nav-link:focus {
  color: #fff;
  background-color: transparent;
}

/* Active state gets a caret at the bottom */
.nav-link.active {
  color: #fff;
}
.nav-link.active:after {
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 0;
  margin-left: -.3rem;
  vertical-align: middle;
  content: "";
  border-right: .3rem solid transparent;
  border-bottom: .3rem solid;
  border-left: .3rem solid transparent;
}


/*
 * Blog name and description
 */

.blog-header {
  padding-bottom: 1.25rem;
  margin-bottom: 2rem;
  border-bottom: .05rem solid #eee;
}
.blog-title {
  margin-bottom: 0;
  font-size: 2rem;
  font-weight: normal;
}
.blog-description {
  font-size: 1.1rem;
  color: #999;
}

@media (min-width: 40em) {
  .blog-title {
    font-size: 3.5rem;
  }
}


/*
 * Main column and sidebar layout
 */

/* Sidebar modules for boxing content */
.sidebar-module {
  padding: 1rem;
  /*margin: 0 -1rem 1rem;*/
}
.sidebar-module-inset {
  padding: 1rem;
  background-color: #f5f5f5;
  border-radius: .25rem;
}
.sidebar-module-inset p:last-child,
.sidebar-module-inset ul:last-child,
.sidebar-module-inset ol:last-child {
  margin-bottom: 0;
}


/* Pagination */
.blog-pagination {
  margin-bottom: 4rem;
}
.blog-pagination > .btn {
  border-radius: 2rem;
}


/*
 * Blog posts
 */

.blog-post {
  margin-bottom: 4rem;
}
.blog-post-title {
  margin-bottom: .25rem;
  font-size: 2.5rem;
}
.blog-post-meta {
  margin-bottom: 1.25rem;
  color: #999;
}


/*
 * Footer
 */

.blog-footer {
  padding: 2.5rem 0;
  color: #999;
  text-align: center;
  background-color: #f9f9f9;
  border-top: .05rem solid #e5e5e5;
}
.blog-footer p:last-child {
  margin-bottom: 0;
}

.js-sidebar img {
  width: 100%;
  height: auto;
  margin-bottom: 20px;
}
!

JS 

              
                    new PrettyScroll('.js-sidebar', {
      container: '.js-container',
      offsetTop: 20,
      breakpoint: 575
    });
!
999px

Console