<div class="block">
  <code>
    border: 8px solid #888;<br>
    Властивість <strong>outline-color</strong> за замовчуванням 
  </code>
</div>
<div class="block outline">
  <code>
    border: 8px solid #888;<br>
    <strong>outline-color: red;</strong>
  </code>
</div>
.block {
  padding: 36px;
  text-align: center;
  border: 8px solid #888;
  outline-width: 16px;
  outline-style: solid;
  background-color: #eee;
  width: 300px;
  margin: 36px;
  font-size: 18px;
}
.outline{
    outline-color: red;
}

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