HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>align-items: stretch</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    section {
      display: flex;
      align-items: stretch;
      gap: 8px;
      height: 180px;
      box-sizing: border-box;
      padding: 8px;
      background: #e2e8f0;
      border: 2px dashed #334155;
    }

    div {
      padding: 10px 16px;
      color: #fff;
      font-weight: 700;
      text-align: center;
    }

    .a {
      background: #1d4ed8;
    }

    .b {
      background: #0f766e;
    }

    .c {
      background: #b45309;
    }
  </style>
</head>
<body>
  <p><strong>align-items: stretch</strong> makes every item as tall as the line. Short, Mid, and Tall end up the same height. No gray band is left above or below them.</p>
  <section>
    <div class="a">Short</div>
    <div class="b">Mid<br>line</div>
    <div class="c">Tall<br>line<br>here</div>
  </section>
</body>
</html>

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CSS align-items Property — stretch