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 URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

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.

If the stylesheet 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 CSS 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

JavaScript

About JavaScript Preprocessors

JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

Learn more · Versions

Babel is required to process package imports. If you need a different preprocessor remove all packages first.

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

Behavior

Save Automatically?

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 Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

Next Step Leave tour

HTML 

              
                .container
  .instruction Hover the paragraph to see the effect 👀 

  h1 HIGHLIGHT 📝
  .content.v2
    p Woah, That's pretty cool, Gotta remember that ! I'm just gonna highlight this for future reference. Who knows I might forget this. Better not forget this. I wish my memory was better, But oh well, that's that.

  h1 SPOILERS 💩
  .content.v3
    p This season is gonna blow your mind ! Like this season is crazy dawg! You know what happens on the first episode ? You are not gonna believe me bro, like It's crazy dude !
    
  h1 UNDERLINE 🍧
  .content.v1
    p This thing is really really important, you don't wanna miss this. Trust me. This is like really really important. like really really.
    
  h1 DASHES 😎
  .content.v4
    p I dont' know dude, May be this could be important, May be not, who knows? I don't know, Do you know? Do you know somebody that knows this maybe, call me maybe.
    
  h1 SEE DELETED 🙈
  .content.v5
    p Remember when I told you about this thing back in the day, when I was younger, you know those days right? Well guess what, I was totally wrong about that. Heh, This is embarassing 
    
  h1 SEE DELETED 🙈2 
  .content.v6
    p Hold on, Hold on. May be I WAS right at the time, they just changed the stuff now. Like I didn't know this was gonna happen, but now that It did, Well I guess I have to remove this now..
    
  h1 CRAZY LINES 🤡
  .content.v7
    p YO! What's up everybody, It's ya-boi Shloopy Mcfloopy-face, back at it again with the new stuff! This time it's gon-be liiiittt, son ! Hit that Subscribbe Button, Smash that bell! See you guys on the next video
    
  h1 SWIPE 🎨
  .content.v8
    p Here is the point, This point of mine is Striking, It is powerful. It is important. I have the data to back that up, Statistics show that this point of mine is indeed true. A Study conducted in 2015 proves that I have been right all along, what you gonna do about it huh?
!

CSS 

              
                green   = #55efc4
red     = #d63031
blue    = #0984e3
purple  = #4834d4
  
body
  font-family   Arial
  font-size     1.5rem
  line-height   150%
  
.container
  max-width   600px
  margin      0 auto
  padding     1em 
  
  h1
    font-size 2.2rem
  
  .instruction
    font-size 1.8rem
    margin-bottom 4rem
    font-style italic
  
 
.content
  margin-bottom 4em
  p
    display inline
    background-repeat no-repeat
    transition all 500ms ease-in-out

// UNDERLINE--------------------------------
.v1
  thickness = 5px
  p
    background-position bottom left
    background-size 0% thickness
    background-image linear-gradient(red, red)
    padding-bottom thickness
  &:hover
    p
      background-size 100% thickness
      
// HIGHLIGHT --------------------------------      
.v2
  p
    background-position left
    background-size 0% 100%
    background-image linear-gradient(green, green)
  &:hover
    p
      background-size: 100% 100%

      
// SPOILERS ------------------------------------------
.v3
  p
    color transparent
    background-position right
    background-size 100% 100%
    background-image linear-gradient(blue, blue)
  &:hover
    p
      color black
      background-size 0% 100%
      
 // DASHES -------------------------------------
.v4
  thickness = 3px
  p
    background-position bottom left
    background-size 0% thickness
    background-image repeating-linear-gradient(to right, purple 0 thickness, transparent 0 (2*thickness))
    padding-bottom thickness
  &:hover
    p
      background-size 100% thickness
      
 // DELETED v1-------------------------------------
.v5
  thickness = 3px
  p
    background-position center left
    background-size 100% thickness
    background-image linear-gradient(to right, black, black)
    padding-bottom thickness
  &:hover
    p
      background-size 100% 100%
      color white
      background-image linear-gradient(to right, red, red)
      
 // DELETED v2-------------------------------------
.v6
  thickness = 4px
  p
    background-position center left
    background-size 100% thickness
    background-image linear-gradient(to right, black, black)
    padding-bottom thickness
  &:hover
    p
      background-position bottom left
      background-size 100% (thickness/2)
      font-style italic
      
      
// CRAZY -------------------------------------
.v7
  p
    background-position left
    background-size 0% 100%
    background-image linear-gradient(to right, green, green)
  &:hover
    p
      background-position right
      background-size 100% 100%
      
      
 // SWIPE -------------------------------------
.v8
  thickness = 4px
  p
    background-position left
    background-size 0% 100%
    background-image linear-gradient(to right, green, yellow)
    padding-bottom thickness
    box-decoration-break clone
    -webkit-box-decoration-break clone
  &:hover
    p
      background-size 100% 100%
!

JS
!
999px

Console