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

              
                <p>
  PC・Macから閲覧している場合はブラウザーのサイズを変更してください。スマートフォンの場合は縦・横を変更してご覧ください。通常時(320px)に背景色をピンク、横向き(568px)の時に青にしています。
</p>
              
            
!

CSS

              
                @media screen and (max-width: 568px){ /* 画面が568pxの場合 */
     body{ background: #80D0FF }
}
@media screen and (max-width: 320px){ /* 画面が320pxの場合 */
    body{ background: #FFDBF3 }
}
body {
  font-family: "ヒラギノ角ゴ Pro W3","Hiragino Kaku Gothic Pro",Meiryo,"メイリオ",Helvetica,Sans-Serif;
}
              
            
!

JS

              
                
              
            
!
999px

Console