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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

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.

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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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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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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.

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HTML 

              
                <div class="marquee">
  <div class="marquee__group">
    <div class="flex items-center">
      <svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" fill="#6CF841" viewBox="0 0 256 256"><path d="M235.33,116.72,139.28,20.66a16,16,0,0,0-22.56,0l-96,96.06a16,16,0,0,0,0,22.56l96.05,96.06h0a16,16,0,0,0,22.56,0l96.05-96.06a16,16,0,0,0,0-22.56ZM120,80a8,8,0,0,1,16,0v56a8,8,0,0,1-16,0Zm8,104a12,12,0,1,1,12-12A12,12,0,0,1,128,184Z"></path></svg> <span>FAILURE</span></div>
    
    <div class="flex items-center">
      <svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" fill="#6CF841" viewBox="0 0 256 256"><path d="M235.33,116.72,139.28,20.66a16,16,0,0,0-22.56,0l-96,96.06a16,16,0,0,0,0,22.56l96.05,96.06h0a16,16,0,0,0,22.56,0l96.05-96.06a16,16,0,0,0,0-22.56ZM120,80a8,8,0,0,1,16,0v56a8,8,0,0,1-16,0Zm8,104a12,12,0,1,1,12-12A12,12,0,0,1,128,184Z"></path></svg> <span>FAILURE</span></div>
    
    <div class="flex items-center">
      <svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" fill="#6CF841" viewBox="0 0 256 256"><path d="M235.33,116.72,139.28,20.66a16,16,0,0,0-22.56,0l-96,96.06a16,16,0,0,0,0,22.56l96.05,96.06h0a16,16,0,0,0,22.56,0l96.05-96.06a16,16,0,0,0,0-22.56ZM120,80a8,8,0,0,1,16,0v56a8,8,0,0,1-16,0Zm8,104a12,12,0,1,1,12-12A12,12,0,0,1,128,184Z"></path></svg> <span>FAILURE</span></div>
    
    <div class="flex items-center">
      <svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" fill="#6CF841" viewBox="0 0 256 256"><path d="M235.33,116.72,139.28,20.66a16,16,0,0,0-22.56,0l-96,96.06a16,16,0,0,0,0,22.56l96.05,96.06h0a16,16,0,0,0,22.56,0l96.05-96.06a16,16,0,0,0,0-22.56ZM120,80a8,8,0,0,1,16,0v56a8,8,0,0,1-16,0Zm8,104a12,12,0,1,1,12-12A12,12,0,0,1,128,184Z"></path></svg> <span>FAILURE</span></div>
  </div>
  <div class="marquee__group">
    
        <div class="flex items-center">
      <svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" fill="#6CF841" viewBox="0 0 256 256"><path d="M235.33,116.72,139.28,20.66a16,16,0,0,0-22.56,0l-96,96.06a16,16,0,0,0,0,22.56l96.05,96.06h0a16,16,0,0,0,22.56,0l96.05-96.06a16,16,0,0,0,0-22.56ZM120,80a8,8,0,0,1,16,0v56a8,8,0,0,1-16,0Zm8,104a12,12,0,1,1,12-12A12,12,0,0,1,128,184Z"></path></svg> <span>FAILURE</span></div>
    
    <div class="flex items-center">
      <svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" fill="#6CF841" viewBox="0 0 256 256"><path d="M235.33,116.72,139.28,20.66a16,16,0,0,0-22.56,0l-96,96.06a16,16,0,0,0,0,22.56l96.05,96.06h0a16,16,0,0,0,22.56,0l96.05-96.06a16,16,0,0,0,0-22.56ZM120,80a8,8,0,0,1,16,0v56a8,8,0,0,1-16,0Zm8,104a12,12,0,1,1,12-12A12,12,0,0,1,128,184Z"></path></svg> <span>FAILURE</span></div>
    
    <div class="flex items-center">
      <svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" fill="#6CF841" viewBox="0 0 256 256"><path d="M235.33,116.72,139.28,20.66a16,16,0,0,0-22.56,0l-96,96.06a16,16,0,0,0,0,22.56l96.05,96.06h0a16,16,0,0,0,22.56,0l96.05-96.06a16,16,0,0,0,0-22.56ZM120,80a8,8,0,0,1,16,0v56a8,8,0,0,1-16,0Zm8,104a12,12,0,1,1,12-12A12,12,0,0,1,128,184Z"></path></svg> <span>FAILURE</span></div>
  </div>
</div>
!

CSS 

              
                * {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  padding: 0;
  margin: 0;
}

.flex {
  color: #6CF841;
  display: flex;
}

svg {
  margin-right: 0.5rem;
}

.items-center {
  align-items: center;
}

body {
  --space: 2rem;

  display: grid;
  align-content: center;
  overflow: hidden;
  gap: var(--space);
  width: 100%;
  font-size: 1.2rem;
  font-family: monospace;
  background-color: #070707;
}

.marquee {
  --duration: 10s;
  --gap: var(--space);

  display: flex;
  overflow: hidden;
  user-select: none;
  gap: var(--gap);
  padding: 0.5rem 0;
background-image: linear-gradient(45deg, #070707 25%, #1c1c1c 25%, #1c1c1c 50%, #070707 50%, #070707 75%, #1c1c1c 75%, #1c1c1c 100%);
background-size: 33.94px 33.94px;
}

.marquee__group {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-around;
  gap: var(--gap);
  min-width: 100%;
  animation: scroll var(--duration) linear infinite;
}

.marquee--reverse .marquee__group {
  animation-direction: reverse;
  animation-delay: calc(var(--duration) / -2);
}

@keyframes scroll {
  0% {
    transform: translateX(0);
  }

  100% {
    transform: translateX(calc(-100% - var(--gap)));
  }
}
!

JS
!
999px

Console