Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. If you link to another Pen, it will include the CSS from that Pen. If the preprocessor matches, it will attempt to combine them before processing.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

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.

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <body>
  <input id="color-mode" type="checkbox" name="color-mode">
  <label for="color-mode">
    <span class="dark-mode-hide">Dark Mode</span>
    <span class="light-mode-hide">Light Mode</span>
  </label>
  <div class="color-scheme-wrapper">
    <h1>No Javascript Dark Mode Toggle</h1>
    <p>Sometimes <code>javascript</code> <strong>fails</strong>, and sometimes people have it <strong>switched off</strong>. </p>
    <p>For those people it's still nice to have the option of toggling <code>dark-mode</code> on and off.</p>
    <p><strong>This example uses:</strong></p>
    <ul>
      <li>No <code>javascript</code></li>
      <li><code>media-queries</code> to default to user preferences.</li>
      <li><code>css variables</code> to make styling way easier.</li>
    </ul>
    <p>If you're interested in learning how to make this you can read the tutorial here: <a href="https://endtimes.dev/no-javascript-dark-mode-toggle/">endtimes.dev</a></p>
    <p>or here: <a href="https://dev.to/shadowfaxrodeo/an-html-and-css-only-dark-mode-toggle-button-1p3c">dev.to</a></p>
    <p>See a live version using <strong>five</strong> color schemes and radio buttons here: <a href="https://missingdice.com/dice-roller">missingdice.com</a></p>
  </div>
</body>
              
            
!

CSS

              
                /* Tutorial CSS starts here */
:root {
  --bg: white;
  --text: black;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: black;
    --text: white;
  }
}

#color-mode:checked ~ * {
  --bg: black;
  --text: white;
}

@media (prefers-color-scheme: dark) {
  #color-mode:checked ~ * {
    --bg: white;
    --text: black;
  }
}

.color-scheme-wrapper {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
}

.light-mode-hide {
  display: none;
}

@media (prefers-color-scheme: dark) {
  .dark-mode-hide {
    display: none;
  }
}

@media (prefers-color-scheme: dark) {
  .light-mode-hide {
    display: initial;
  }
}

/* Tutorial css ends here, the rest is extra styles for prettiness */

:root {
  font-size: 16px;
  font-family: -apple-system, BlinkMacSystemFont, avenir next, avenir,
    helvetica neue, helvetica, Ubuntu, roboto, noto, segoe ui, arial, sans-serif;
}

* {
  box-sizing: border-box;
  max-width: 35rem;
}

html,
body,
div {
  max-width: none;
}

p {
  line-height: 1.5;
}

code {
  font-family: Menlo, Consolas, Monaco, Liberation Mono, Lucida Console,
    monospace;
}

input[type="checkbox"] {
  opacity: 0.00001;
  position: absolute;
}

html,
body {
  padding: 0;
  margin: 0;
}

div > * + *,
ul > * + * {
  margin-top: 1.5rem;
}

::selection {
  background: var(--text);
  color: var(--bg);
}

label {
  cursor: pointer;
  position: absolute;
  background: var(--text);
  color: var(--bg);
  padding: 1rem;
  top: 1rem;
  left: 1rem;
  display: flex;
  align-items: center;
  border-radius: 6px;
  box-shadow: 0 2px var(--bg), 0 4px var(--text);
  user-select: none;
}

input[type="checkbox"]:focus + label {
  outline: 2px dashed red;
  outline-offset: 4px;
}

label:active {
  transform: translateY(1px);
  box-shadow: 0 1px var(--bg), 0 3px var(--text);
}

label:after {
  content: "✔\FE0E";
  height: 1.2rem;
  width: 1.2rem;
  margin-left: 1rem;
  border: solid 2px var(--bg);
  text-align: center;
  border-radius: 4px;
  color: transparent;
}

#color-mode:checked + label:after {
  color: var(--bg);
}

.color-scheme-wrapper {
  padding: 5rem 1rem;
}

a {
  color: inherit;
  text-decoration: none;
  border: dotted 1px var(--text);
  padding: 0.1em 0.2em;
}

ul {
  list-style: none;
  margin: 0;
  padding-left: 1rem;
}

li:before {
  margin-left: -1rem;
  float: left;
  content: "▸";
  color: red;
}

              
            
!

JS

              
                    
              
            
!
999px

Console