HTML Code

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

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

    div {
      height: 140px;
      padding: 24px;
      border: 8px dashed #94a3b8;
      color: #1e3a8a;
      background: content-box #dbeafe;
    }
  </style>
</head>
<body>
  <p>One <strong>content-box</strong> value sets origin and clip. The blue fill stays inside the padding edge.</p>
  <div>content-box</div>
</body>
</html>

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CSS background Property — content-box