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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.

!
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.

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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).

Add External Stylesheets/Pens

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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.

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JavaScript

About JavaScript Preprocessors

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

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Babel includes JSX processing.

Add External Scripts/Pens

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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.

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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.

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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.

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HTML 

              
                <link href='https://fonts.googleapis.com/css?family=Titillium+Web:400,200,300,600,700' rel='stylesheet' type='text/css'>
<link href="//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet">
<button id="toggleButton">Toggle</button>

<ul class="timeline" id="timeline">
  <li class="li complete">
    <div class="timestamp">
      <span class="author">Abhi Sharma</span>
      <span class="date">11/15/2014<span>
    </div>
    <div class="status">
      <h4> Shift Created </h4>
    </div>
  </li>
  <li class="li complete">
    <div class="timestamp">
      <span class="author">PAM Admin</span>
      <span class="date">11/15/2014<span>
    </div>
    <div class="status">
      <h4> Email Sent </h4>
    </div>
  </li>
  <li class="li complete">
    <div class="timestamp">
      <span class="author">Aaron Rodgers</span>
      <span class="date">11/15/2014<span>
    </div>
    <div class="status">
      <h4> SIC Approval </h4>
    </div>
  </li>
  <li class="li">
    <div class="timestamp">
      <span class="author">PAM Admin</span>
      <span class="date">TBD<span>
    </div>
    <div class="status">
      <h4> Shift Completed </h4>
    </div>
  </li>
 </ul>
!

CSS 

              
                .timeline
  list-style-type: none
  display: flex
  align-items: center
  justify-content: center
.li
  transition: all 200ms ease-in

.timestamp
  margin-bottom: 20px
  padding: 0px 40px
  display: flex
  flex-direction: column
  align-items: center
  font-weight: 100
.status
  padding: 0px 40px
  display: flex
  justify-content: center
  border-top: 2px solid #D6DCE0
  position: relative
  transition: all 200ms ease-in  
  h4
    font-weight: 600
  &:before
    content: ''
    width: 25px
    height: 25px
    background-color: white
    border-radius: 25px
    border: 1px solid #ddd
    position: absolute
    top: -15px
    left: 42%
    transition: all 200ms ease-in 
.li.complete
  .status
    border-top: 2px solid #66DC71
    &:before
      background-color: #66DC71
      border: none
      transition: all 200ms ease-in 
    h4
      color: #66DC71

@media (min-device-width: 320px) and (max-device-width: 700px)
  .timeline
    list-style-type: none
    display: block
  .li
    transition: all 200ms ease-in
    display: flex
    width: inherit
  .timestamp
    width: 100px
  .status
    &:before
      left: -8%
      top: 30%
      transition: all 200ms ease-in 

/// Layout stuff
html,body
  width: 100%
  height: 100%
  display: flex
  justify-content: center
  font-family: 'Titillium Web', sans serif
  color: #758D96

button
  position: absolute
  width: 100px
  min-width: 100px
  padding: 20px
  margin: 20px
  font-family: 'Titillium Web', sans serif
  border: none
  color: white
  font-size: 16px
  text-align: center
#toggleButton
  position: absolute
  left: 50px
  top: 20px
  background-color: #75C7F6
!

JS 

              
                var completes = document.querySelectorAll(".complete");
var toggleButton = document.getElementById("toggleButton");


function toggleComplete(){
  var lastComplete = completes[completes.length - 1];
  lastComplete.classList.toggle('complete');
}

toggleButton.onclick = toggleComplete;
!
999px

Console