<header>
  <h2 class="title">element.style.top</h2>
  <p class="description">Встановлює вертикальну позицію елемента відносно його батьківського контейнера.</p>
</header>
<main>
  <div class="result">
    <div id="movableBox" class="box"></div>
    <button id="moveUp">Вгору</button>
    <button id="moveDown">Вниз</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);
  text-align: center;
}

.box {
  width: 50px;
  height: 50px;
  background-color: #3498db;
  position: absolute;
  top: 100px;
  left: 50%;
  transform: translateX(-50%);
}

button {
  margin: 10px;
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
}

document.getElementById('moveUp').addEventListener('click', () => {
    let box = document.getElementById('movableBox');
    let currentTop = parseInt(box.style.top) || 0;
    box.style.top = (currentTop - 10) + 'px';
});

document.getElementById('moveDown').addEventListener('click', () => {
    let box = document.getElementById('movableBox');
    let currentTop = parseInt(box.style.top) || 0;
    box.style.top = (currentTop + 10) + 'px';
});

External CSS

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External JavaScript

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