<header>
  <h2 class="title">element.style.height</h2>
  <p class="description">Задає або змінює висоту елемента на вебсторінці.</p>
</header>
<main>
  <div class="result">
    <div id="box" class="box"></div>
    <button id="increaseBtn">Збільшити висоту</button>
    <button id="decreaseBtn">Зменшити висоту</button>
    <button id="resetBtn">Скинути висоту</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: 100px;
  height: 100px;
  background-color: #4CAF50;
  transition: height 0.5s ease;
}

button {
  margin: 10px 5px;
  padding: 10px 15px;
  font-size: 14px;
}

document.getElementById('increaseBtn').addEventListener('click', function() {
  const box = document.getElementById('box');
  let currentHeight = parseInt(window.getComputedStyle(box).height);
  box.style.height = (currentHeight + 50) + 'px';
});

document.getElementById('decreaseBtn').addEventListener('click', function() {
  const box = document.getElementById('box');
  let currentHeight = parseInt(window.getComputedStyle(box).height);
  if (currentHeight > 50) {
    box.style.height = (currentHeight - 50) + 'px';
  }
});

document.getElementById('resetBtn').addEventListener('click', function() {
  const box = document.getElementById('box');
  box.style.height = '100px';
});

External CSS

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