CodePen Embed - Learn CSS

<main>
  <div class="wrapper">
    <article class="flow">
      <h1>A primary heading</h1>
      <h2>A secondary heading</h2>
      <h3>A tertiary heading</h3>
      <p><a href="#elements">Skip to elements</a> - <a href="#layouts">Skip to layouts</a></p>
      <p>
        Sed posuere consectetur est at lobortis. Vivamus sagittis lacus vel augue
        laoreet rutrum faucibus dolor auctor. Fusce dapibus, tellus ac cursus commodo,
        tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus. Etiam
        porta sem malesuada magna mollis euismod. Etiam porta sem malesuada magna
        mollis euismod. Etiam porta sem malesuada magna mollis euismod.
      </p>
      <p>
        Curabitur blandit tempus porttitor. Donec id elit non mi porta gravida at eget
        metus. Maecenas sed diam eget risus varius blandit sit amet non magna.
        Vestibulum id ligula porta felis euismod semper.
      </p>
      <ul>
        <li>
          Morbi in sem quis dui placerat ornare. Pellentesque odio nisi, euismod in,
          pharetra a, ultricies in, diam. Sed arcu. Cras consequat.
        </li>
        <li>
          Praesent dapibus, neque id cursus faucibus, tortor neque egestas augue, eu
          vulputate magna eros eu erat. Aliquam erat volutpat. Nam dui mi, tincidunt
          quis, accumsan porttitor, facilisis luctus, metus.
        </li>
        <li>
          Phasellus ultrices nulla quis nibh. Quisque a lectus. Donec consectetuer
          ligula vulputate sem tristique cursus. Nam nulla quam, gravida non, commodo
          a, sodales sit amet, nisi.
        </li>
        <li>
          Pellentesque fermentum dolor. Aliquam quam lectus, facilisis auctor,
          ultrices ut, elementum vulputate, nunc.
        </li>
      </ul>
      <hr />
      <h2>Color util classes</h2>
      <p>
        The <code>bg-</code> prefix classes will set your
        <code>background</code> property and the <code>color-</code> prefix classes
        will set your <code>color</code> property.
      </p>
      <div class="[ box ] [ bg-primary ]">
        <code>bg-primary - color-primary</code>
      </div>
      <div class="[ box ] [ bg-primary-dark ]">
        <code>bg-primary-dark - color-primary-dark</code>
      </div>
      <div class="[ box ] [ bg-primary-light ]">
        <code>bg-primary-light - color-primary-light</code>
      </div>
      <div class="[ box ] [ bg-primary-x-light ]">
        <code>bg-primary-x-light - color-primary-x-light</code>
      </div>
      <div class="[ box ] [ bg-light ]">
        <code>bg-light - color-light</code>
      </div>
      <div class="[ box ] [ bg-dark ]">
        <code>bg-dark - color-dark</code>
      </div>
      <div class="[ box ] [ bg-off-white ]">
        <code>bg-off-white - color-off-white</code>
      </div>
      <div class="[ box ] [ bg-mid ]">
        <code>bg-mid - color-mid</code>
      </div>
      <div class="[ box ] [ bg-mid-dark ]">
        <code>bg-mid-dark - color-mid-dark</code>
      </div>
      <hr />
      <h2 id="elements">Elements</h2>
      <h3>Box</h3>
      <div class="box">Hello I am a box and used for little layout demos</div>
      <h3>Buttons</h3>
      <button class="button">Hello I am a button</button>
      <button class="button" data-type="secondary">
        Hello I am a secondary button
      </button>
      <h3>Callout</h3>
      <figure class="callout">
        <p>
          Cras justo odio, dapibus ac facilisis in, egestas eget quam. Integer posuere
          erat a ante venenatis dapibus posuere velit aliquet. Cum sociis natoque
          penatibus et magnis dis parturient montes, nascetur ridiculus mus.
        </p>
      </figure>
      <h3>Toggle</h3>
      <label class="toggle" for="toggle-element">
        <span class="toggle__label">Toggle’s label goes here</span>
        <input type="checkbox" role="switch" class="toggle__element" id="toggle-element" />
        <div class="toggle__decor" aria-hidden="true">
          <div class="toggle__thumb"></div>
        </div>
      </label>
      <h3>Dimensions Label</h3>
      <div class="dimension-label" aria-live="polite" aria-label="Current box width">
        <span data-element="width-label">400px</span>
      </div>
      <div class="dimension-label" aria-live="polite" aria-label="Current box height" data-orientation="vertical">
        <span data-element="height-label">400px</span>
      </div>

      <h2 id="layouts">Layouts</h2>
      <h3>Cluster</h3>
      <p><a href="https://every-layout.dev/layouts/cluster/">More info here</a>.</p>
      <div>
        <div class="cluster">
          <div class="box">Cluster item</div>
          <div class="box">Cluster item</div>
          <div class="box">Cluster item</div>
          <div class="box">Cluster item</div>
          <div class="box">Cluster item</div>
          <div class="box">Cluster item</div>
          <div class="box">Cluster item</div>
          <div class="box">Cluster item</div>
          <div class="box">Cluster item</div>
          <div class="box">Cluster item</div>
          <div class="box">Cluster item</div>
        </div>
      </div>
      <h3>Flow</h3>
      <p><a href="https://piccalil.li/quick-tip/flow-utility">More info here</a>.</a>
      <div class="flow">
        <p>This whole page is flowing with <code>.flow</code> already.</p>
        <p>It gives us auto-flowing content and finite control with <code>--flow-space</code> as an when we need it.</p>
        <p style="--flow-space: 5rem">This element has <code>--flow-space</code> set to <code>5 rem</code>.</p>
      </div>
      <h3>Sidebar</h3>
      <p><a href="https://every-layout.dev/layouts/sidebar/">More info here</a>.</p>
      <div>
        <div class="sidebar">
          <div class="box">I am the sidebar</div>
          <div class="box">I am the content</div>
        </div>
      </div>
      <h3>Switcher</h3>
      <p><a href="https://every-layout.dev/layouts/switcher/">More info here</a>.</p>
      <div>
        <div class="switcher">
          <div class="box">I am an switcher item</div>
          <div class="box">I am an switcher item</div>
          <div class="box">I am an switcher item</div>
          <div class="box">I am an switcher item</div>
        </div>
      </div>
    </article>
  </div>
</main>

/* PULL IN FONTS AND RESET */
@import url("https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,400;0,500;0,700;1,400;1,500&display=swap");
@import url("https://unpkg.com/modern-css-reset/dist/reset.min.css");

/* SETTINGS */
:root {
  --color-primary: #3740ff;
  --color-primary-dark: #272eb5;
  --color-primary-light: #3740ff;
  --color-primary-x-light: #e8f0fe;
  --color-light: #ffffff;
  --color-dark: #202124;
  --color-off-white: #f3f4f4;
  --color-mid: #5f6368;
  --color-mid-dark: #3c4043;
  --color-stroke: #dadce0;
  --metric-gutter: 1.5rem;
  --metric-box-spacing: 1rem;
  --metric-radius: 3px;
  --generic-shadow: 0px 1px 2px rgba(60, 64, 67, 0.3),
    0px 2px 6px 2px rgba(60, 64, 67, 0.15);
  --font-mono: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
}

/* PROP-CONTROLLED UTIL CLASSES */
.color-primary {
  color: var(--color-primary);
}

.color-primary-dark {
  color: var(--color-primary-dark);
}

.color-primary-light {
  color: var(--color-primary-light);
}

.color-primary-x-light {
  color: var(--color-primary-x-light);
}

.color-light {
  color: var(--color-light);
}

.color-dark {
  color: var(--color-dark);
}

.color-off-white {
  color: var(--color-off-white);
}

.color-mid {
  color: var(--color-mid);
}

.color-mid-dark {
  color: var(--color-mid-dark);
}

.bg-primary {
  background: var(--color-primary);
}

.bg-primary-dark {
  background: var(--color-primary-dark);
}

.bg-primary-light {
  background: var(--color-primary-light);
}

.bg-primary-x-light {
  background: var(--color-primary-x-light);
}

.bg-light {
  background: var(--color-light);
}

.bg-dark {
  background: var(--color-dark);
}

.bg-off-white {
  background: var(--color-off-white);
}

.bg-mid {
  background: var(--color-mid);
}

.bg-mid-dark {
  background: var(--color-mid-dark);
}

/* GLOBAL STYLES */
body {
  min-height: 100vh;
  padding: 2rem 0;
  display: flex;
  flex-direction: column;
  font-family: "Roboto", Arial, Helvetica, sans-serif;
  background: var(--color-light);
  color: var(--color-dark);
  line-height: 1.55;
  letter-spacing: 0.03ch;
}

main {
  flex: auto;
}

a:not([class]) {
  color: var(--color-primary);
}

a:hover {
  text-decoration: none;
}

:is(h1, h2, h3) {
  font-weight: 500;
  line-height: 1.2;
  max-width: 50ch;
}

h1 {
  font-size: 2.25rem;
}

h2 {
  font-size: 1.75rem;
  color: var(--color-mid-dark);
}

h3 {
  font-size: 1.25rem;
}

:is(p, li, blockquote, dl) {
  max-width: 65ch;
}

ul {
  padding: 0 0 0 1.3rem;
}

li + li {
  margin-top: 1rem;
}

code {
  padding: 0.125em 0.25em;
  background: var(--color-off-white);
  border: 1px solid var(--color-stroke);
  font-family: var(--font-mono);
  font-size: 0.85em;
  hyphens: none;
  tab-size: 2;
  text-align: left;
  word-spacing: normal;
  white-space: nowrap;
}

figcaption {
  margin-top: 0.5em;
  font-weight: normal;
  text-align: left;
}

select {
  padding: 0.5rem;
  min-width: 12rem;
  font: inherit;
  border: 1px solid var(--color-stroke);
}

select:focus {
  border-color: var(--color-primary);
}

hr {
  border: 0;
  border-top: 1px solid var(--color-stroke);
  margin: 4rem auto !important; /* Gotta be sure this overrides flow rules etc */
}

label::after {
  content: "\A";
  white-space: pre;
}

::marker {
  color: var(--color-mid);
  font-size: 1.5em;
}

/* GENERIC UTILITIES */

/* https://piccalil.li/quick-tip/flow-utility */
.flow > * + * {
  margin-top: var(--flow-space, 2em);
}

/* https://piccalil.li/quick-tip/use-css-clamp-to-create-a-more-flexible-wrapper-utility */
.wrapper {
  width: 90vw;
  width: clamp(16rem, 90vw, 70rem);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--metric-gutter);
  padding-right: var(--metric-gutter);
  position: relative;
}

/* ELEMENTS */
.box {
  padding: var(--metric-box-spacing);
  border: 1px solid var(--color-stroke);
  box-shadow: var(--generic-shadow);
  font-weight: 500;
  text-align: center;
  max-width: 40rem;
}

.box:not([class*="bg-"]) {
  background: var(--color-off-white);
}

.button,
button {
  display: inline-flex;
  align-items: center;
  justify-items: center;
  background: var(--color-primary);
  border: 1px solid var(--color-primary);
  border-radius: var(--metric-radius);
  color: var(--color-light);
  cursor: pointer;
  font: inherit;
  padding: 1rem;
  position: relative;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.1ch;
  transition: background-color 0.2s, box-shadow 0.2s;
  overflow: hidden;
  position: relative;
  white-space: nowrap;
  box-shadow: none;
}

.button:hover,
button:hover {
  box-shadow: var(--generic-shadow);
  background: var(--color-primary-light);
}

.button[data-type="secondary"],
button[data-type="secondary"] {
  background: var(--color-light);
  color: var(--color-dark);
  border-color: var(--color-stroke);
}

.button[data-type="secondary"]:hover,
button[data-type="secondary"]:hover {
  background: var(--color-off-white);
}

/* CALLOUT */
.callout {
  padding: var(--metric-box-spacing) var(--metric-box-spacing)
    var(--metric-box-spacing) 3rem;
  background: var(--color-primary-x-light);
  border: 1px solid var(--color-primary-light);
  color: var(--color-primary-dark);
  position: relative;
  max-width: 40rem;
}

.callout::before {
  content: "";
  background-image: url('data:image/svg+xml;utf8,<svg fill="%23272eb5" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32"><path d="M14 9.5c0-.825.675-1.5 1.5-1.5h1c.825 0 1.5.675 1.5 1.5v1c0 .825-.675 1.5-1.5 1.5h-1c-.825 0-1.5-.675-1.5-1.5v-1zM20 24h-8v-2h2v-6h-2v-2h6v8h2z"/><path d="M16 0C7.163 0 0 7.163 0 16s7.163 16 16 16 16-7.163 16-16S24.837 0 16 0zm0 29C8.82 29 3 23.18 3 16S8.82 3 16 3s13 5.82 13 13-5.82 13-13 13z"/></svg>');
  background-size: cover;
  width: 1.25rem;
  height: 1.25rem;
  display: block;
  position: absolute;
  top: var(--metric-box-space);
  left: 1rem;
}

.callout p + p {
  margin-top: 1em;
}

.callout a {
  color: var(--color-primary-dark);
  font-weight: bold;
}

/* TOGGLE */
.toggle {
  --metric-toggle-thumb-size: 1rem;
  --metric-toggle-thumb-space: 0.25rem;

  position: relative;
  display: inline-flex;
  align-items: center;
}

.toggle__element {
  opacity: 0;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  right: var(--metric-toggle-thumb-size);
  width: 1em;
  height: 1em;
}

.toggle__decor {
  display: block;
  position: relative;
  overflow: hidden;
  width: calc(
    (var(--metric-toggle-thumb-size) * 2) +
      (var(--metric-toggle-thumb-space) * 2)
  );
  height: calc(
    var(--metric-toggle-thumb-size) + (var(--metric-toggle-thumb-space) * 2)
  );
  background: var(--color-mid);
  margin-left: 0.5rem;
  border-radius: var(--metric-toggle-thumb-size);
  box-sizing: content-box;
  border: 1px solid var(--color-light);
}

.toggle__thumb {
  display: grid;
  place-items: center;
  width: var(--metric-toggle-thumb-size);
  height: var(--metric-toggle-thumb-size);
  border-radius: var(--metric-toggle-thumb-size);
  background: linear-gradient(
      229.84deg,
      rgba(255, 255, 255, 0) 14.29%,
      rgba(48, 48, 48, 0.15) 81.82%
    ),
    #ffffff;
  box-shadow: var(--generic-shadow);
  position: absolute;
  top: var(--metric-toggle-thumb-space);
  left: var(--metric-toggle-thumb-space);
  transform: none;
  transition: transform 200ms cubic-bezier(1, 0, 0.55, 0.85);
  will-change: transform;
  z-index: 1;
}

.toggle__thumb::before {
  content: "";
  display: none;
  width: calc(
    var(--metric-toggle-thumb-size) - var(--metric-toggle-thumb-space)
  );
  height: calc(
    var(--metric-toggle-thumb-size) - var(--metric-toggle-thumb-space)
  );
  border: 1px solid var(--color-primary-light);
  border-radius: calc(
    var(--metric-toggle-thumb-size) - var(--metric-toggle-thumb-space)
  );
}

.toggle__thumb::before {
  content: "";
  display: none;
  width: calc(
    var(--metric-toggle-thumb-size) - var(--metric-toggle-thumb-space)
  );
  height: calc(
    var(--metric-toggle-thumb-size) - var(--metric-toggle-thumb-space)
  );
  border: 1px solid var(--color-primary);
  border-radius: calc(
    var(--metric-toggle-thumb-size) - var(--metric-toggle-thumb-space)
  );
}

.toggle__decor:hover .toggle__thumb {
  margin-left: 1px;
}

:checked + .toggle__decor:hover .toggle__thumb {
  margin-left: -1px;
}

:checked + .toggle__decor {
  background: var(--color-primary-light);
}

:checked + .toggle__decor .toggle__thumb {
  transform: translateX(var(--metric-toggle-thumb-size)) rotate(270deg);
}

:focus + .toggle__decor:not(:hover) .toggle__thumb::before {
  display: block;
}

:disabled + .toggle__decor {
  filter: grayscale(1) brightness(1.5);
  cursor: not-allowed;
}

/* DIMENSIONS LABEL */
.dimension-label {
  position: relative;
  text-align: center;
  font-family: var(--font-mono);
  color: var(--color-primary-dark);
}

.dimension-label::before {
  content: "";
  width: 134px;
  height: 8px;
  background-image: url('data:image/svg+xml;utf8,<svg viewBox="0 0 134 8" fill="%23DADCE0" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M0 3.897L6.75 0v3.397h120.5V0L134 3.897l-6.75 3.897V4.397H6.75v3.397L0 3.897z"/></svg>');
  background-position: center center;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.dimension-label > * {
  display: inline-block;
  padding: 0.25em;
  background: var(--color-light);
  position: relative;
  z-index: 1;
}

.dimension-label[data-orientation="vertical"] {
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.dimension-label[data-orientation="vertical"]::before {
  transform: translate(-50%, -50%) rotate(90deg);
}

/* CLUSTER LAYOUT */
.cluster {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  align-items: center;
  margin: calc(var(--metric-gutter) / 2 * -1);
}

.cluster > * {
  margin: calc(var(--metric-gutter) / 2);
}

/* SIDEBAR LAYOUT */

.sidebar {
  --sidebar-min-content-width: 50%;

  display: flex;
  flex-wrap: wrap;
  margin: calc(var(--metric-gutter) / 2 * -1);
}

.sidebar > * {
  margin: calc(var(--metric-gutter) / 2);
  flex-grow: 1;
}

.sidebar > :last-child {
  flex-basis: 0;
  flex-grow: 999;
  min-width: calc(var(--sidebar-min-content-width) - var(--metric-gutter));
}

/* SWITCHER LAYOUT */

.switcher {
  --switcher-threshold: 40rem;

  display: flex;
  flex-wrap: wrap;
  margin: calc((var(--metric-gutter) / 2) * -1);
}

.switcher > * {
  flex-grow: 1;
  flex-basis: calc(
    (var(--switcher-threshold) - (100% - var(--metric-gutter))) * 999
  );
  margin: calc(var(--metric-gutter) / 2);
}

.switcher > :nth-last-child(n + 5),
.switcher > :nth-last-child(n + 5) ~ * {
  flex-basis: 100%;
}

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