Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URLs added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using its URL and the proper URL extension.

+ 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

Auto Save

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

              
                <div class="browser">
  <div class="browser__header">
    <span></span>
    <span></span>
    <span></span>
  </div>
  <div class="browser__body">
    <div class="header">
      <h1 class="logo"><a href="https://www.w3cplus.com"><img src="https://www.w3cplus.com/sites/all/themes/w3cplusV2/images/logo.png" alt="W3cplus"></a></h1>
      <nav class="menu">
        <ul>
          <li><a href="https://www.w3cplus.com/blog/tags/686.html">会员专栏</a></li>
          <li><a href="https://www.w3cplus.com/CSS3">CSS</a></li>
          <li><a href="https://www.w3cplus.com/JavaScript">JavaScript</a></li>
          <li><a href="https://www.w3cplus.com/mobile">Mobile</a></li>
          <li><a href="https://www.w3cplus.com/svg-tutorial">SVG</a></li>
        </ul>
      </nav>
      <div class="menu__icon">
        <span>menu</span>
        <svg t="1638455499563" class="icon" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="6454" xmlns:xlink="http://www.w3.org/1999/xlink" width="200" height="200">
          <defs>
            <style type="text/css"></style>
          </defs>
          <path d="M170.666667 213.333333m64 0l554.666666 0q64 0 64 64l0 0q0 64-64 64l-554.666666 0q-64 0-64-64l0 0q0-64 64-64Z" fill="currentColor" p-id="6455"></path>
          <path d="M234.666667 640h554.666666a64 64 0 0 1 0 128h-554.666666a64 64 0 0 1 0-128z m0-213.333333h554.666666a64 64 0 0 1 0 128h-554.666666a64 64 0 0 1 0-128z" fill="currentColor" p-id="6456"></path>
        </svg>
      </div>
    </div>
  </div>
</div>
              
            
!

CSS

              
                @import url("https://fonts.googleapis.com/css2?family=Exo:wght@600&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  width: 100vw;
  min-height: 100vh;
  font-family: "Exo", Arial, sans-serif;
  background-color: #557;
  padding: 20px;

  display: grid;
  place-content: center;
}

.browser {
  display: grid;
  max-inline-size: 80vw;
  min-inline-size: 40vw;
  min-block-size: 60vh;
  grid-template-rows: min-content auto;
  overflow: hidden;
  resize: horizontal;
}

.browser__header {
  min-height: 60px;
  background-color: #435986;
  border-radius: 16px 16px 0 0;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 20px;
}

.browser__header > span {
  display: block;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: #edc100;
}

.browser__header > span:first-child {
  background-color: #ff4275;
}

.browser__header > span:last-child {
  background-color: #6bcb7a;
}

.browser__body {
  background-color: #f5f5f5;
  border-radius: 0 0 10px 10px;
}

.header {
  min-height: 80px;
  background-color: #333;
  padding: 0 20px;
  display: grid;
  gap: 10px;
  grid-template-columns: min-content auto min-content;
  color: #fff;
  align-items: center;
}

.logo {
  width: 68px;
  aspect-ratio: 1 / 1;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #00a3cf;
}

.logo img {
  max-width: 100%;
  height: auto;
  display: block;
}

.menu ul {
  list-style: none outside none;
  display: flex;
  align-items: center;
  gap: 20px;
}

.menu a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: #9e9e9e;
  text-decoration: none;
  transition: all 0.2s ease-in-out;
  font-size: 24px;
  white-space: nowrap;
}

.menu a:hover {
  color: #fff;
}

.menu__icon {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  font-size: 24px;
}

.menu__icon span {
  display: block;
  font-weight: 700;
  text-transform: uppercase;
  line-height: 1;
}

.icon {
  width: 1.2em;
  height: 1.2em;
}

.browser {
  container-type: inline-size;
}

.menu {
  display: none;
}

@container (width > 768px) {
  .menu {
    display: block;
  }
  .menu__icon {
    display: none;
  }
}

              
            
!

JS

              
                
              
            
!
999px

Console