HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>CSS border-image-source Linear Gradient Example</title>

  <style>

    body {

      font-family: sans-serif;

      padding: 1.5rem;

      background: #f8fafc;

    }

    .card {

      max-width: 16rem;

      padding: 1rem;

      border: 4px solid transparent;

      border-image-source: linear-gradient(135deg, #2563eb, #7c3aed);

      border-image-slice: 1;

      background: #fff;

    }

  </style>

</head>

<body>

  <h1>Linear Gradient Border</h1>

  <div class="card">Gradient border</div>

</body>

</html>

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CSS border-image-source Property - Linear Gradient