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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.

HTML

              
                 <h1>Custom properties
  <br>applied safely</h1>
 <small>(Even for old browsers)</small>
              
            
!

CSS

              
                // 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;
  }
}

              
            
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JS

              
                
              
            
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