HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>align-content: flex-start</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;
      flex-wrap: wrap;
      align-items: flex-start;
      height: 220px;
      align-content: flex-start;
      box-sizing: border-box;
      padding: 8px;
      background: #e2e8f0;
      border: 2px dashed #334155;
    }

    div {
      width: 50%;
      box-sizing: border-box;
      padding: 12px 8px;
      text-align: center;
      color: #fff;
      font-weight: 700;
      border: 2px solid #e2e8f0;
    }

    .line1 {
      background: #1d4ed8;
    }

    .line2 {
      background: #0f766e;
    }
  </style>
</head>
<body>
  <p>Blue is line 1. Green is line 2. <strong>align-content: flex-start</strong> packs both lines at the top. The spare gray space is below them.</p>
  <section>
    <div class="line1">Line 1 · One</div>
    <div class="line1">Line 1 · Two</div>
    <div class="line2">Line 2 · Three</div>
    <div class="line2">Line 2 · Four</div>
  </section>
</body>
</html>

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CSS align-content Property — flex-start