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-width Per-Side Example</title>

  <style>

    body {

      font-family: sans-serif;

      padding: 1.5rem;

      background: #f8fafc;

    }

    .panel {

      max-width: 16rem;

      padding: 1rem;

      border: 10px solid transparent;

      border-image-source: repeating-linear-gradient(45deg, #2563eb 0 8px, #fff 8px 16px);

      border-image-slice: 8;

      border-image-width: 6px 16px 6px 16px;

      border-image-repeat: round;

      background: #fff;

    }

  </style>

</head>

<body>

  <h1>Asymmetric Width</h1>

  <div class="panel">Different widths per side</div>

</body>

</html>

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CSS border-image-width Property - Per-Side Values