<header>
  <h2 class="title">element.style.marginRight</h2>
  <p class="description">Змінює відступ елемента справа.</p>
</header>
<main>
  <div class="result">
    <div id="movingBlock" class="block"></div>
    <div class="block red"></div>
    <br>
    <button id="moveRightBtn">→ Вправо</button>
    <button id="moveLeftBtn">Вліво ←</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);
}

.block {
  width: 50px;
  height: 50px;
  background-color: #3498db;
  margin-right: 0px;
  transition: margin-right 0.3s ease;
  display: inline-block;
}

.block.red {
  background-color: #ff0000;
}

button {
  margin-top: 10px;
  margin-right: 10px;
  padding: 10px;
  background-color: #3498db;
  color: white;
  border: none;
  cursor: pointer;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #2980b9;
}

const movingBlock = document.getElementById('movingBlock');
const moveRightBtn = document.getElementById('moveRightBtn');
const moveLeftBtn = document.getElementById('moveLeftBtn');

moveRightBtn.addEventListener('click', () => {
  const currentMarginRight = parseInt(window.getComputedStyle(movingBlock).marginRight, 10);
  movingBlock.style.marginRight = (currentMarginRight + 20) + 'px';
});

moveLeftBtn.addEventListener('click', () => {
  const currentMarginRight = parseInt(window.getComputedStyle(movingBlock).marginRight, 10);
  movingBlock.style.marginRight = (currentMarginRight - 20) + 'px';
});

External CSS

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External JavaScript

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