CodePen Embed - CSS Custom Properties: Changing Shadow Offset

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<a href="#" class="box">
  <p>
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.box {
  /* Does not exist as a CSS property: */
  --box-shadow-offset: 5px;
  box-shadow:
    var(--box-shadow-offset)
    var(--box-shadow-offset)
    10px
    rgba(0, 0, 0, 0.5);
}  
​
.box:hover {
  --box-shadow-offset: 10px;
}
​
​
​
​
/* etc. */
.box {
  display: block;
  border: 1px solid grey;
  padding: 1em;
  max-width: 20em;
  text-decoration: none;
  color: #000;
}
​
body {
  margin: 2em;
}
​

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