HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS border-block-color Split Colors</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }
    .block {
      border-style: solid;
      border-width: 4px;
      border-block-color: blue green;
      padding: 1rem;
      max-width: 24rem;
    }
  </style>
</head>
<body>
  <h1>Block with Custom Border Colors</h1>
  <div class="block">This block has a blue top border and a green bottom border.</div>
</body>
</html>

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CSS border-block-color Property - Blue and Green Borders