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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.

!
Insecure Resource

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CSS

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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-.

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div class="content">
      <header>
        <h1>001: Aesthetic Layouts</h1>
      </header>
      <main>
        <div class="columns">
          <div class="column">
            <div class="outside">
              <div class="quote-holder">
                <blockquote aria-hidden="true">The joy of pixels.</blockquote>
              </div>
            </div>
            <p>
              <span class="drop"></span>
              lorem ipsum dolor sit amet, consectetur adipisicing, elit. Eos,
              illo! Voluptatibus eos quas quasi in enim quaerat praesentium
              voluptates facilis esse, sint, laudantium similique cumque laborum
              at veniam hic sit.
            </p>
            <p>
              Ipsam quidem beatae iusto harum obcaecati expedita sint
              consequuntur, necessitatibus quos accusantium aliquam, eveniet,
              optio ad deserunt laudantium! Nobis molestias at sint est natus
              libero modi harum iusto consequatur quisquam.
            </p>
            <p>
              Earum, deserunt quaerat id sapiente quae debitis, atque voluptatum
              vitae, sint error magni architecto rerum possimus maiores porro
              aut quidem rem exercitationem. Quae quaerat reprehenderit, sit
              harum repellendus provident temporibus.
            </p>
            <p>
              Consectetur, maxime iure in, quod itaque, dolorem atque nisi
              inventore assumenda maiores veritatis aliquam illo accusantium
              molestiae ex vero. Quaerat qui minima aut consequuntur fugiat
              fugit nihil asperiores. Laborum, fugit.
            </p>
            <p>
              Ipsam, nam. Incidunt quas deserunt corporis ullam non qui aut ab
              fugiat pariatur sunt, molestias voluptatibus iste dolorum velit
              dignissimos saepe facere nihil iure quos laborum cupiditate
              dolores ducimus quaerat!
            </p>
          </div>
          <div class="column">
            <div class="outside"></div>
            <p>
              Obcaecati, quisquam ex illum aspernatur. Necessitatibus possimus
              rerum excepturi aliquid totam laboriosam reprehenderit vitae cum
              tempore porro voluptas, eaque quos saepe recusandae molestiae
              maiores labore modi fuga adipisci eius odit.
            </p>
            <p>
              Cum amet recusandae doloremque aspernatur veniam eligendi magnam
              laborum atque aliquid aperiam corrupti doloribus accusamus dicta
              soluta eius, non, dolorum expedita voluptas libero quas obcaecati
              eaque aliquam! Recusandae, ex alias.
            </p>
            <p>
              Adipisci tenetur libero quis aspernatur at quas reiciendis beatae
              ut nisi velit est dolores sunt illum dignissimos deserunt
              recusandae, dolorum culpa? Sed accusantium modi labore repellendus
              unde, quos dicta nulla?
            </p>
            <p>
              Eius velit, quaerat exercitationem voluptatem officia facere
              quibusdam nisi odio veritatis id rerum nesciunt et quis
              perferendis modi architecto magnam similique neque. Dolores quae
              aliquid officiis quaerat debitis excepturi ullam.
            </p>
            <p>
              Deleniti quas vero perspiciatis quae placeat pariatur officia
              officiis dolores dicta totam cum consequatur similique, iste
              veritatis quos distinctio dolor voluptatum, odio. Cupiditate sed
              doloribus provident ullam at dolorem beatae!
            </p>
          </div>
        </div>
      </main>
    </div>
    <a
      class="bear-link"
      href="https://twitter.com/intent/follow?screen_name=jh3yy"
      target="_blank"
      rel="noreferrer noopener"
    >
      <svg
        class="w-9"
        viewBox="0 0 969 955"
        fill="none"
        xmlns="http://www.w3.org/2000/svg"
      >
        <circle
          cx="161.191"
          cy="320.191"
          r="133.191"
          stroke="currentColor"
          stroke-width="20"
        ></circle>
        <circle
          cx="806.809"
          cy="320.191"
          r="133.191"
          stroke="currentColor"
          stroke-width="20"
        ></circle>
        <circle
          cx="695.019"
          cy="587.733"
          r="31.4016"
          fill="currentColor"
        ></circle>
        <circle
          cx="272.981"
          cy="587.733"
          r="31.4016"
          fill="currentColor"
        ></circle>
        <path
          d="M564.388 712.083C564.388 743.994 526.035 779.911 483.372 779.911C440.709 779.911 402.356 743.994 402.356 712.083C402.356 680.173 440.709 664.353 483.372 664.353C526.035 664.353 564.388 680.173 564.388 712.083Z"
          fill="currentColor"
        ></path>
        <rect
          x="310.42"
          y="448.31"
          width="343.468"
          height="51.4986"
          fill="#FF1E1E"
        ></rect>
        <path
          fill-rule="evenodd"
          clip-rule="evenodd"
          d="M745.643 288.24C815.368 344.185 854.539 432.623 854.539 511.741H614.938V454.652C614.938 433.113 597.477 415.652 575.938 415.652H388.37C366.831 415.652 349.37 433.113 349.37 454.652V511.741L110.949 511.741C110.949 432.623 150.12 344.185 219.845 288.24C289.57 232.295 384.138 200.865 482.744 200.865C581.35 200.865 675.918 232.295 745.643 288.24Z"
          fill="currentColor"
        ></path>
      </svg>
    </a>
!

CSS 

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

html {
	color-scheme: light only;
}

body {
	min-height: 100vh;
	font-family:  "SF Pro Text", "SF Pro Icons", "AOS Icons", "Helvetica Neue", Helvetica, Arial, sans-serif, system-ui;
}

body::before {
  --size: 60px;
  --line: hsl(0 0% 0% / 0.15);
  content: '';
  height: 100vh;
  width: 100vw;
  position: fixed;
  background: linear-gradient(
        90deg,
        var(--line) 1px,
        transparent 1px var(--size)
      )
      50% 50% / var(--size) var(--size),
    linear-gradient(var(--line) 1px, transparent 1px var(--size)) 50% 50% /
      var(--size) var(--size);
  mask: linear-gradient(-15deg, transparent 30%, white);
  top: 0;
  transform-style: flat;
  pointer-events: none;
  z-index: -1;
}

h1 {
	margin: 0;
	font-family: monospace;
	text-transform: uppercase;
}

header {
	padding: 8rem 0 2rem;
}

.content {
	width: 700px;
	max-width: calc(100% - 2rem);
	margin: 0 auto;
}

.drop {
	--drop: clamp(1.5rem, 1vw + 1rem, 6rem); 	
	height: var(--drop);
	width: calc(var(--drop) * 2.25);
	aspect-ratio: 4 / 3;
	float: left;
	position: relative;
	shape-outside: inset(0 0 0 0);
}

.drop::after {
	content: "CSS";
	position: absolute;
	inset: 0;
	display: grid;
	line-height: 2rem;
	font-size: calc(var(--drop) * 1);
	font-weight: 600;
	text-align: left;
	place-items: start;
}

.quote-holder {
	position: absolute;
	left: calc(100% + (var(--gap) * 0.5));
	top: calc(var(--y) * 1%);
	height: calc(var(--size) * 2px);
	aspect-ratio: 1;
	background: radial-gradient(white 0% 50%, transparent 70%);
	translate: -50% -50%;
	border-radius: 50%;
	margin: 0;
	font-weight: 600;
	font-size: 1.5rem;
	text-align: center;
	container-type: inline-size;
	display: grid;
	place-items: center;
}

blockquote {
	margin: 0;
	text-align: center;
	font-size: 14cqi;
}

.columns {
	display: flex;
	gap: var(--gap);
}

:root {
	--size: 100;
	--y: 200;
	--x: 50;
	--gap: 1rem;
}

.outside {
	position: relative;
	width: calc(var(--size) * 1px);
	height: calc(100% + (var(--size) * 1px));
}

.column:first-of-type .outside {
	float: right;
  shape-outside: circle(calc(var(--size) * 1px) at 100% calc(var(--y) * 1%));
}
.column:last-of-type .outside {
	float: left;
  shape-outside: circle(calc(var(--size) * 1px) at 0 calc(var(--y) * 1%));
}

.columns p {
	font-size: .875rem;
	text-align: justify;
}

.outside {
	float: right;
	shape-outside: circle(50%);
}
/* Social */
.bear-link {
  color: canvasText;
  position: fixed;
  top: 1rem;
  left: 1rem;
  width: 48px;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  opacity: 0.8;
}

:where(.x-link, .bear-link):is(:hover, :focus-visible) {
  opacity: 1;
}
.bear-link svg {
  width: 75%;
}
!

JS 

              
                import { Pane } from 'https://cdn.skypack.dev/tweakpane'

const CONFIG = {
  size: 120,
  y: 30,
}

const CTRL = new Pane({ title: 'Configuration', expanded: false })

const update = () => {
  document.documentElement.style.setProperty('--size', CONFIG.size)
  document.documentElement.style.setProperty('--y', CONFIG.y)
}

CTRL.addBinding(CONFIG, 'size', { min: 50, step: 1, max: 300, label: 'Size (px)' })
CTRL.addBinding(CONFIG, 'y', { min: 0, step: 1, max: 100, label: 'Y (%)' })

CTRL.on('change', update)
update()
!
999px

Console