<header>
<h2 class="title">element.style.borderColor</h2>
<p class="description">Змінює колір рамки навколо HTML-елемента.</p>
</header>
<main>
<div class="result">
  <div id="colorBox">Рамка</div>
  <select id="colorSelect">
    <option value="black">Чорний</option>
    <option value="red">Червоний</option>
    <option value="green">Зелений</option>
    <option value="blue">Синій</option>
    <option value="purple">Фіолетовий</option>
  </select>
</div>
</main>
body {
  font-size: 16px;
  line-height: 1.5;
  font-family: monospace;
}

header {
  background-color: #f1f1f1;
  margin-bottom: 25px;
  padding: 15px;
  -webkit-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  -moz-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
}

header h2.title {
  padding-bottom: 15px;
  border-bottom: 1px solid #999;
}

header p.description {
  font-style: italic;
  color: #222;
}

.result {
  background-color: #f8f8f8;
  padding: 15px;
  -webkit-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  -moz-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
}

#colorBox {
  width: 150px;
  height: 100px;
  border: 2px solid black;
  text-align: center;
  line-height: 100px;
  margin-bottom: 20px;
}

#colorSelect {
  font-family: monospace;
}
document.getElementById('colorSelect').addEventListener('change', function() {
  let selectedColor = this.value;
  document.getElementById('colorBox').style.borderColor = selectedColor;
});

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