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<!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-slice fill Example</title>

  <style>

    body {

      font-family: sans-serif;

      padding: 1.5rem;

      background: #f8fafc;

    }

    h1 {

      margin-bottom: 0.5rem;

    }

    p.lead {

      color: #64748b;

      font-size: 0.9rem;

      margin-bottom: 1.25rem;

      max-width: 32rem;

      line-height: 1.5;

    }

    .compare {

      display: flex;

      flex-wrap: wrap;

      gap: 1.5rem;

    }

    .item label {

      display: block;

      font-size: 0.75rem;

      font-weight: 700;

      color: #64748b;

      margin-bottom: 0.35rem;

      text-transform: uppercase;

      letter-spacing: 0.03em;

    }

    .box {

      width: 200px;

      height: 90px;

      padding: 0.75rem;

      border: 10px solid transparent;

      border-image-source: linear-gradient(

        to bottom,

        #2563eb 0,

        #2563eb 30%,

        #fef08a 30%,

        #fef08a 70%,

        #7c3aed 70%,

        #7c3aed 100%

      );

      border-image-slice: 25%;

      border-image-repeat: stretch;

      background: #fff;

      font-size: 0.8rem;

      font-weight: 600;

      color: #334155;

      box-sizing: border-box;

    }

    .box.with-fill {

      border-image-slice: 25% fill;

    }

  </style>

</head>

<body>

  <h1>Slice with fill</h1>

  <p class="lead">Without <code>fill</code>, the center slice is discarded and the white background shows through. With <code>fill</code>, the yellow center region is painted inside the border.</p>

  <div class="compare">

    <div class="item">

      <label>25% slice — no fill</label>

      <div class="box">White inside</div>

    </div>

    <div class="item">

      <label>25% fill</label>

      <div class="box with-fill">Yellow center slice</div>

    </div>

  </div>

</body>

</html>
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CSS border-image-slice Property - fill Keyword
