<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  
  <div class="orange">I'm orange.</div>
  <div class="orange-lighten">I'm a lighten orange.</div>
  <div class="orange-darken">I'm a darken orange.</div>
  <div class="mixed-color">I'm a mixed color background.</div>
  
</body>
</html>
$orange-color: orange;

.orange {
  background-color: $orange-color
}

.orange-lighten {
  background-color: lighten($orange-color, 25%);
}

.orange-darken {
  background-color: darken($orange-color, 10%);
}

.mixed-color {
  background-color: mix($orange-color, blue);
  color:white;
}
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