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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>

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!
Insecure Resource

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CSS

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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

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div class="siteWrap">

  <div class="flexWrap">

    <header>Wonder CMS Rocks</header>

    <div class="wrap">

      <nav>

        <a href="#">Link 1</a>
        <a href="#">Link 2</a>
        <a href="#">Link 3</a>
        <a href="#">Link 4</a>
        <a href="#">Link 5</a>

      </nav>

      <main>

        <h1>Yup Wonder CMS Still Rocks</h1>

        <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi nec nulla at tortor varius consequat. Donec sed turpis nibh. Phasellus non massa molestie nisl fringilla varius. Pellentesque in pellentesque quam, eget egestas dolor. Pellentesque varius porttitor sem eu mattis. Etiam vel semper justo, non malesuada urna. Nullam malesuada interdum purus, eget scelerisque urna consequat quis. Mauris nunc mi, varius sit amet aliquam eu, vulputate ac nulla. Fusce auctor dolor a ipsum sagittis mattis. Phasellus et blandit augue. Cras sed quam sit amet risus faucibus vulputate.</p>

        <p>Vivamus consequat, velit sit amet condimentum venenatis, ante urna congue diam, non porta dui turpis vitae turpis. Fusce faucibus mollis sem. In maximus lacus vitae consectetur aliquam. Etiam mattis orci at elit volutpat lacinia. Aenean volutpat mi turpis. Vivamus tincidunt enim in urna dignissim mattis. Donec eget libero finibus, venenatis ante eget, scelerisque sapien.</p>

        <p>Mauris eu nulla hendrerit, rutrum est vitae, maximus turpis. Proin elit erat, feugiat ac convallis mattis, tincidunt sed orci. Cras sodales rutrum vulputate. Morbi non sapien nunc. Proin quam ipsum, accumsan at elementum at, luctus a mi. Cras lobortis, enim sed maximus venenatis, ipsum tortor sagittis odio, dapibus tincidunt justo massa sit amet ex. Donec pharetra tortor et mi elementum pharetra. Donec tristique tortor nec elementum molestie. Maecenas facilisis tristique purus ut interdum. Suspendisse id eros maximus, lacinia neque sit amet, lacinia turpis. Nulla nisi velit, suscipit id orci ac, tincidunt finibus ante. Vivamus mattis elementum sagittis.</p>

        <p>Ut quis aliquam sapien. Phasellus dictum fringilla mauris sed laoreet. Pellentesque ultricies tortor ut libero pulvinar laoreet. Aliquam et tellus augue. Nulla at felis finibus, mattis orci a, rhoncus mi. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Ut mollis et erat posuere commodo. Pellentesque ullamcorper at nisi et viverra. Nam vel vestibulum nulla. Phasellus odio est, ultrices nec arcu sed, molestie rhoncus nisi. Ut vel gravida ipsum, nec mattis nisi.</p>

        <p>Cras aliquet leo id est imperdiet pulvinar. Suspendisse fringilla nisl porttitor, faucibus dui sed, dictum ligula. Vestibulum eu massa ut velit finibus venenatis. Ut a elit ac nunc sodales convallis. Nullam sit amet risus dui. Proin tortor dui, euismod at ultrices id, consectetur vel libero. In hac habitasse platea dictumst. Quisque facilisis sit amet nunc eget auctor. Proin lorem odio, condimentum ut placerat eu, imperdiet eu dui. Lorem ipsum dolor sit amet, consectetur adipiscing elit. In tempor dolor vel purus sagittis cursus.</p>

        <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi nec nulla at tortor varius consequat. Donec sed turpis nibh. Phasellus non massa molestie nisl fringilla varius. Pellentesque in pellentesque quam, eget egestas dolor. Pellentesque varius porttitor sem eu mattis. Etiam vel semper justo, non malesuada urna. Nullam malesuada interdum purus, eget scelerisque urna consequat quis. Mauris nunc mi, varius sit amet aliquam eu, vulputate ac nulla. Fusce auctor dolor a ipsum sagittis mattis. Phasellus et blandit augue. Cras sed quam sit amet risus faucibus vulputate.</p>

        <p>Vivamus consequat, velit sit amet condimentum venenatis, ante urna congue diam, non porta dui turpis vitae turpis. Fusce faucibus mollis sem. In maximus lacus vitae consectetur aliquam. Etiam mattis orci at elit volutpat lacinia. Aenean volutpat mi turpis. Vivamus tincidunt enim in urna dignissim mattis. Donec eget libero finibus, venenatis ante eget, scelerisque sapien.</p>

        <p>Mauris eu nulla hendrerit, rutrum est vitae, maximus turpis. Proin elit erat, feugiat ac convallis mattis, tincidunt sed orci. Cras sodales rutrum vulputate. Morbi non sapien nunc. Proin quam ipsum, accumsan at elementum at, luctus a mi. Cras lobortis, enim sed maximus venenatis, ipsum tortor sagittis odio, dapibus tincidunt justo massa sit amet ex. Donec pharetra tortor et mi elementum pharetra. Donec tristique tortor nec elementum molestie. Maecenas facilisis tristique purus ut interdum. Suspendisse id eros maximus, lacinia neque sit amet, lacinia turpis. Nulla nisi velit, suscipit id orci ac, tincidunt finibus ante. Vivamus mattis elementum sagittis.</p>

        <p>Ut quis aliquam sapien. Phasellus dictum fringilla mauris sed laoreet. Pellentesque ultricies tortor ut libero pulvinar laoreet. Aliquam et tellus augue. Nulla at felis finibus, mattis orci a, rhoncus mi. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Ut mollis et erat posuere commodo. Pellentesque ullamcorper at nisi et viverra. Nam vel vestibulum nulla. Phasellus odio est, ultrices nec arcu sed, molestie rhoncus nisi. Ut vel gravida ipsum, nec mattis nisi.</p>

        <p>Cras aliquet leo id est imperdiet pulvinar. Suspendisse fringilla nisl porttitor, faucibus dui sed, dictum ligula. Vestibulum eu massa ut velit finibus venenatis. Ut a elit ac nunc sodales convallis. Nullam sit amet risus dui. Proin tortor dui, euismod at ultrices id, consectetur vel libero. In hac habitasse platea dictumst. Quisque facilisis sit amet nunc eget auctor. Proin lorem odio, condimentum ut placerat eu, imperdiet eu dui. Lorem ipsum dolor sit amet, consectetur adipiscing elit. In tempor dolor vel purus sagittis cursus.</p>

        <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi nec nulla at tortor varius consequat. Donec sed turpis nibh. Phasellus non massa molestie nisl fringilla varius. Pellentesque in pellentesque quam, eget egestas dolor. Pellentesque varius porttitor sem eu mattis. Etiam vel semper justo, non malesuada urna. Nullam malesuada interdum purus, eget scelerisque urna consequat quis. Mauris nunc mi, varius sit amet aliquam eu, vulputate ac nulla. Fusce auctor dolor a ipsum sagittis mattis. Phasellus et blandit augue. Cras sed quam sit amet risus faucibus vulputate.</p>

        <p>Vivamus consequat, velit sit amet condimentum venenatis, ante urna congue diam, non porta dui turpis vitae turpis. Fusce faucibus mollis sem. In maximus lacus vitae consectetur aliquam. Etiam mattis orci at elit volutpat lacinia. Aenean volutpat mi turpis. Vivamus tincidunt enim in urna dignissim mattis. Donec eget libero finibus, venenatis ante eget, scelerisque sapien.</p>

        <p>Mauris eu nulla hendrerit, rutrum est vitae, maximus turpis. Proin elit erat, feugiat ac convallis mattis, tincidunt sed orci. Cras sodales rutrum vulputate. Morbi non sapien nunc. Proin quam ipsum, accumsan at elementum at, luctus a mi. Cras lobortis, enim sed maximus venenatis, ipsum tortor sagittis odio, dapibus tincidunt justo massa sit amet ex. Donec pharetra tortor et mi elementum pharetra. Donec tristique tortor nec elementum molestie. Maecenas facilisis tristique purus ut interdum. Suspendisse id eros maximus, lacinia neque sit amet, lacinia turpis. Nulla nisi velit, suscipit id orci ac, tincidunt finibus ante. Vivamus mattis elementum sagittis.</p>

        <p>Ut quis aliquam sapien. Phasellus dictum fringilla mauris sed laoreet. Pellentesque ultricies tortor ut libero pulvinar laoreet. Aliquam et tellus augue. Nulla at felis finibus, mattis orci a, rhoncus mi. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Ut mollis et erat posuere commodo. Pellentesque ullamcorper at nisi et viverra. Nam vel vestibulum nulla. Phasellus odio est, ultrices nec arcu sed, molestie rhoncus nisi. Ut vel gravida ipsum, nec mattis nisi.</p>

        <p>Cras aliquet leo id est imperdiet pulvinar. Suspendisse fringilla nisl porttitor, faucibus dui sed, dictum ligula. Vestibulum eu massa ut velit finibus venenatis. Ut a elit ac nunc sodales convallis. Nullam sit amet risus dui. Proin tortor dui, euismod at ultrices id, consectetur vel libero. In hac habitasse platea dictumst. Quisque facilisis sit amet nunc eget auctor. Proin lorem odio, condimentum ut placerat eu, imperdiet eu dui. Lorem ipsum dolor sit amet, consectetur adipiscing elit. In tempor dolor vel purus sagittis cursus.</p>

      </main>

    </div>

    <footer>

      <div class="top">

        <a href="#">Info Link 1</a>
        <a href="#">Info Link 2</a>
        <a href="#">Info Link 3</a>

      </div>

      <div class="bottom">

        <p>A tiny bit of text which you could use as a credit or something</p>

      </div>

    </footer>

  </div>

</div>
!

CSS 

              
                /* Modern CSS Reset */
/*https://github.com/elad2412/the-new-css-reset*/

*:where(:not(iframe, canvas, img, svg, video):not(svg *, symbol *)) {
  all: unset;
  display: revert;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

ol,
ul {
  list-style: none;
}

img {
  max-width: 100%;
}

table {
  border-collapse: collapse;
}

textarea {
  white-space: revert;
}

/* Text */

:root {
  --darkBlue: #00406a;
}

h1 {
  text-align: center;
  font-size: 4rem;
  margin-top: 3rem;
  color: var(--darkBlue);
}

/* Structure */

html {
  font: 10px "Helvetica Neue", Arial, Helvetica, Geneva, sans-serif;
  background: #00416a; /* fallback for old browsers */
  background: -webkit-linear-gradient(
    to top,
    #e4e5e6,
    #00416a
  ); /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(
    to top,
    #e4e5e6,
    #00416a
  ); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}

body {
}

.siteWrap {
  display: flex;
  flex-flow: column nowrap;
  justify-content: flex-start;
  align-items: center;
}

.siteWrap .flexWrap {
  max-width: 120rem;
}

.siteWrap .flexWrap .wrap {
  margin-right: 2rem;
  margin-left: 2rem;
  display: flex;
  flex-flow: row nowrap;
  justify-content: flex-start;
  align-items: flex-start;
}

/*Core Sections*/

nav {
  background-color: var(--darkBlue);
  min-width: 27rem;
  margin-right: 2.5rem;
  align-self: stretch;
  display: flex;
  flex-flow: column nowrap;
  justify-content: space-around;
  align-items: center;
  align-content: center;
  padding-top: 1rem;
  height: calc(100vh - 1rem);
  position: sticky;
  top: 0;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.11);
}

header {
  height: 20rem;
  background-color: var(--darkBlue);
  margin: 2rem;
  display: flex;
  flex-flow: row nowrap;
  justify-content: space-around;
  align-items: center;
  align-content: center;
  color: white;
  font-weight: bold;
  font-size: 5rem;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.11);
}

main {
  background-color: white;
  border-radius: 10px;
  border-style: var(--darkBlue);
}

footer {
  background-color: var(--darkBlue);
  height: 10rem;
  margin: 2rem;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.11);
  display: flex;
  flex-flow: column nowrap;
  justify-content: flex-start;
  align-items: flex-start;
  padding: 1rem;
}

/* Content */

main p {
  font-size: 1.8rem;
  margin: 2.5rem 2rem 2.5rem;
  line-height: 3rem;
}

/* Nav */

nav a {
  background-color: white;
  display: block;
  width: calc(100% - 2rem);
  height: 100%;
  margin-bottom: 1rem;
  display: flex;
  flex-flow: row nowrap;
  justify-content: space-around;
  align-items: center;
  align-content: center;
  font-weight: bold;
  text-decoration: none;
  font-size: 4rem;
  box-shadow: 0 0 5px black;
  border-radius: 10px;
}

/* Footer */

footer > div {
  width: 100%;
}

footer .top {
  flex: 1;
  display: flex;
  flex-flow: row nowrap;
  justify-content: space-around;
  align-items: center;
  align-content: center;
  margin-bottom: 1rem;
}

footer .top a {
  display: block;
  flex: 1;
  align-self: stretch;
  background-color: white;
  display: flex;
  flex-flow: row nowrap;
  justify-content: center;
  align-items: center;
}

footer .top a:first-child {
  border-radius: 1rem 0 0 0;
  margin-right: 2rem;
}

footer .top a:last-child {
  border-radius: 0 1rem 0 0;
  margin-left: 2rem;
}

footer .bottom {
	text-align: center;
	color: white;
	font-size: 1.2rem;
	background-color: white;
	padding: .5rem;
}

footer .bottom p {
	color: black;
}

/* Mobile */

@media only screen and (max-width: 1000px) {
  html {
    font-size: 8px;
  }
}

@media only screen and (max-width: 800px) {
  html {
    font-size: 6px;
  }
}
!

JS
!
999px

Console