<header>
  <h2 class="title">alignItems</h2>
  <p class="description">Вирівнює flex-елементи вздовж перпендикулярної до головної осі лінії всередині контейнера.</p>
</header>
<main>
  <div class="controls">
    <label>
      <input type="radio" name="alignment" value="flex-start" checked> flex-start
    </label>
    <label>
      <input type="radio" name="alignment" value="flex-end"> flex-end
    </label>
    <label>
      <input type="radio" name="alignment" value="center"> center
    </label>
    <label>
      <input type="radio" name="alignment" value="baseline"> baseline
    </label>
    <label>
      <input type="radio" name="alignment" value="stretch"> stretch
    </label>
  </div>
  <div class="result">
    <div class="flex-container">
      <div class="item tall">Елемент 1<br>з додатковим<br>текстом</div>
      <div class="item">Елемент 2</div>
      <div class="item">Елемент 3</div>
    </div>
  </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);
}

.flex-container {
  display: flex;
  height: 200px;
  align-items: flex-start;
}

.item {
  background-color: #ccc;
  border: 1px solid #999;
  padding: 10px;
  margin: 5px;
}

.tall {
  font-size: 1.2em;
}
const alignments = document.querySelectorAll('input[name="alignment"]');
const container = document.querySelector('.flex-container');

alignments.forEach(alignment => {
  alignment.addEventListener('change', () => {
    container.style.alignItems = alignment.value;
  });
});

External CSS

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