HTML Code

<!DOCTYPE html>

<html>

<head>

  <title>CSS border-image-outset Example</title>

  <style>

    body {

      font-family: sans-serif;

      padding: 1.5rem;

      background: #f8fafc;

    }

    .border-box {

      width: 200px;

      height: 120px;

      border: 10px solid transparent;

      border-image: linear-gradient(135deg, #2563eb, #dc2626, #059669) 1;

      border-image-outset: 10px;

      background: #fff;

    }

  </style>

</head>

<body>

  <h1>Box with Extended Border Image</h1>

  <div class="border-box"></div>

</body>

</html>

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CSS border-image-outset Property - 10px Outset