Pen Settings

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

You're using npm packages, so we've auto-selected Babel for you here, which we require to process imports and make it all work. If you need to use a different JavaScript preprocessor, remove the packages in the npm tab.

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

Use npm Packages

We can make npm packages available for you to use in your JavaScript. We use webpack to prepare them and make them available to import. We'll also process your JavaScript with Babel.

⚠️ This feature can only be used by logged in users.

Code Indentation

     

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.

HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
               <h1>Custom properties
  <br>applied safely</h1>
 <small>(Even for old browsers)</small>
            
          
!
            
              // gets a specific value from the fake custom properties map
// $vars is the map, you could find it @ variables.scss
@function getCSSvar($key){
  @if map-has-key($vars, $key){
    @return map-get($vars, $key);
  } @else {
    @warn $key + ' is not a valid variable name';
    // Lime is an horrible & not undercover color so it is perfect to highlight an error
    @return unquote('lime');
  }
} 

// cssVars( <[map]>(<[ property ]>: <[ value ]>)  )
//
// get a given map
// the mixin loops through it and get from the original variables map
// the current value and apply it using a single value and 
// a custom property with its fallback so it is available for all browsers
//
// .element {
//   @include cssVars(
//    (
//      background-color: --primary-color, 
//      color: --secondary-color
//    )
//  );
// }
//
@mixin cssVars($map) {
  @if (type-of($map) == 'map') {
    @each $prop in $map {
      $key: nth($prop, 1);
      $value: nth($prop, 2);
      
      $var: getCSSvar($value);
  
      #{$key}: $var;
      #{$key}: var(#{$value}, $var);
    }
  } @else {
    @warn 'Consider to use a MAP instead of a ' + type-of($map) + 'u son of a ...';
    
    @if type-of($map == 'list') {
      $key: nth($map, 1);
      $value: nth($map, 2);
      
      $var: getCSSvar($value);
  
      #{$key}: $var;
      #{$key}: var(#{$value}, $var);
    }
  }
}

// Custom Properties Map
// -----------
$vars: (
  --primary-color: #B23A68,
  --secondary-color: #A67499,
  --tertiary-color: #3b3b3b,
  --padded: 2rem,
  --border: 2px solid #333
);

*,
*:after,
*:before {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    box-sizing: inherit;
    font-family: 'Franklin Gothic Medium', sans-serif
}

body {
  // using as a list
  @include cssVars((background, --tertiary-color));
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  
  h1 {
    // using as a map w/ multiple registers
    @include cssVars((
      color: --secondary-color,
      padding: --padded,
      border-bottom: --border
    ));
    text-align: center;
  }
  
  small {
    // using as a map w/ 1 register
    @include cssVars((color: --secondar-color));  // this variable does not exist
    margin: 0;
  }
}

            
          
!
999px
🕑 One or more of the npm packages you are using needs to be built. You're the first person to ever need it! We're building it right now and your preview will start updating again when it's ready.

Console