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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

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

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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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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.

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HTML 

              
                <div class="circle-border">
  <div class="circle">
    <h1>Personal Training</h1>
    <p>Become the best version of YOU.</p>
  </div>
</div>
!

CSS 

              
                $border-color: yellow;

body {
  background-color: gray;
  text-align: center;
}

h1, p {
  color: white;
}

.circle-border {
  width: 300px;
  height: 300px;
  border-radius: 100%;
  padding: 30px;
  background-color: black;
}

.circle {
  width: 300px;
  height: 300px;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  text-align: center;
  
  background: none;
  border: 0;
  box-sizing: border-box;
  
  // Using inset box-shadow instead of border for sizing simplicity
  border-radius: 100%;
  font-size: inherit;
  font-weight: 700;

  // Required, since we're setting absolute on pseudo-elements
  position: relative;
  vertical-align: middle;

  &::before,
  &::after {
    box-sizing: inherit;
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
     border-radius: 100%;
  }
  
  &:hover {
    color: $border-color;
  }

  &::before,
  &::after {
    top: 0;
    left: 0;
  }

  &::before {
    border: 2px solid transparent; // We're animating border-color again
  }

  &:hover::before {
    border-top-color: $border-color; // Show borders
    border-right-color: $border-color;
    border-bottom-color: $border-color;

    transition:
      border-top-color 0.15s linear, // Stagger border appearances
      border-right-color 0.15s linear 0.10s,
      border-bottom-color 0.15s linear 0.20s;
  }

  &::after {
    border: 0 solid transparent; // Makes border thinner at the edges? I forgot what I was doing
  }

  &:hover::after {
    border-top: 2px solid $border-color; // Shows border
    border-left-width: 2px; // Solid edges, invisible borders
    border-right-width: 2px; // Solid edges, invisible borders
    transform: rotate(270deg); // Rotate around circle
    transition:
      transform 0.4s linear 0s,
      border-left-width 0s linear 0.35s; // Solid edge post-rotation
  }
}
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JS
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999px

Console