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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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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

About JavaScript Preprocessors

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

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Babel includes JSX processing.

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Packages

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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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HTML 

              
                <div class="container">
  <a class="btn btn-1">Hover me</a>
  <a class="btn btn-2">Hover me</a>
  <a class="btn btn-3">Hover me</a> 
  <a class="btn btn-4">Hover me</a> 
  <a class="btn btn-5">Hover me</a>
</div>
!

CSS 

              
                /* <- Demo Stuff Start */

body{
  font-family: 'Montserrat', sans-serif;
  margin:0;
}

.container {
  display: flex;
  justify-content: center;
  align-items: center;
  align-content: center;
  flex-wrap: wrap;
  width: 80vw;
  margin: 0 auto;
  min-height: 100vh;
}
.btn {
  flex: 1 1 auto;
  margin: 10px;
  padding: 30px;
  text-align: center;
  text-transform: uppercase;
  transition: 0.5s;
  background-size: 200% auto;
  color: white;
 /* text-shadow: 0px 0px 10px rgba(0,0,0,0.2);*/
  box-shadow: 0 0 20px #eee;
  border-radius: 10px;
 }

/* Demo Stuff End -> */

/* <- Magic Stuff Start */

.btn:hover {
  background-position: right center; /* change the direction of the change here */
}

.btn-1 {
  background-image: linear-gradient(to right, #f6d365 0%, #fda085 51%, #f6d365 100%);
}

.btn-2 {
  background-image: linear-gradient(to right, #fbc2eb 0%, #a6c1ee 51%, #fbc2eb 100%);
}

.btn-3 {
  background-image: linear-gradient(to right, #84fab0 0%, #8fd3f4 51%, #84fab0 100%);
}

.btn-4 {
  background-image: linear-gradient(to right, #a1c4fd 0%, #c2e9fb 51%, #a1c4fd 100%);
}

.btn-5 {
  background-image: linear-gradient(to right, #ffecd2 0%, #fcb69f 51%, #ffecd2 100%);
}

/* Magic Stuff End -> */
!

JS 

              
                // You can change the directon of the background change in the :hover state. Don't forget to then also change the background-color direction in the button itself. Let me know if you need any help.
!
999px

Console