<header>
  <h2 class="title">element.style.border</h2>
  <p class="description">Змінює або встановлює стиль рамки навколо HTML-елемента.</p>
</header>
<main>
  <div class="result">
    <div id="box" class="box">Зразок тексту</div>
    <button id="solidBtn">Суцільна рамка</button>
    <button id="dashedBtn">Пунктирна рамка</button>
    <button id="noneBtn">Без рамки</button>
  </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);
}

.box {
  width: 200px;
  height: 100px;
  margin-bottom: 20px;
  text-align: center;
  line-height: 100px;
  background-color: #e0e0e0;
}

document.getElementById('solidBtn').addEventListener('click', function() {
  document.getElementById('box').style.border = '2px solid black';
});

document.getElementById('dashedBtn').addEventListener('click', function() {
  document.getElementById('box').style.border = '2px dashed red';
});

document.getElementById('noneBtn').addEventListener('click', function() {
  document.getElementById('box').style.border = 'none';
});

External CSS

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External JavaScript

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