Double border color css

.double-border {
  display: block;
  clear: both;
  background: red;
  border: 5px solid yellow;
  outline: 5px solid blue;
  transition: 0.7s all ease-in;
  height: 50px;
  width: 50px;
}
.double-border:hover {
  background: yellow;
  outline-color: red;
  border-color: blue;
}
<div class="double-border"></div>

Source: stackoverflow.com

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