<div class="block">
  <p>Задаємо колір за допомогою <strong><code>border-color</code></strong></p>
</div>
.block {
  font-family: sans-serif;
  line-height: 1.45;
  font-size: 17px;
  padding: 12px;
  
  border-width: 8px;
  border-color: cyan;
  border-style: solid;
}

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