<header>
  <h2 class="title">element.style.animationDuration</h2>
  <p class="description">Встановлює тривалість анімації елемента.</p>
</header>

<main>
  <div class="result">
    <div class="box animated" id="box"></div>
    <br>
    <label for="duration">Тривалість анімації (в секундах):</label>
    <input type="number" id="duration" value="2" min="0" step="0.1">
    <button id="apply">Застосувати</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: red;
}

.animated {
  animation: move 2s linear infinite;
}

@keyframes move {
  from { transform: translateX(0); }
  to { transform: translateX(200px); }
}
const box = document.getElementById('box');
const durationInput = document.getElementById('duration');
const applyButton = document.getElementById('apply');

applyButton.addEventListener('click', () => {
  const newDuration = durationInput.value + 's';
  box.style.animationDuration = newDuration;
});

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