HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS background-size Comparison</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.25rem;
      background: #f8fafc;
    }
    .grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 1rem;
      max-width: 48rem;
    }
    .box {
      height: 140px;
      border-radius: 0.75rem;
      border: 1px solid #cbd5e1;
      background-color: #eff6ff;
      background-image: linear-gradient(135deg, #2563eb 0%, #7c3aed 40%, #ec4899 75%, #f97316 100%);
      background-repeat: no-repeat;
      background-position: center;
    }
    .auto { background-size: auto; }
    .cover { background-size: cover; }
    .contain { background-size: contain; }
    h2 {
      margin: 0 0 0.35rem;
      font-size: 0.9rem;
      color: #0f172a;
    }
  </style>
</head>
<body>
  <h1>background-size values</h1>
  <div class="grid">
    <div><h2>auto</h2><div class="box auto"></div></div>
    <div><h2>cover</h2><div class="box cover"></div></div>
    <div><h2>contain</h2><div class="box contain"></div></div>
  </div>
</body>
</html>

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CSS background-size Property - auto, cover, contain Comparison