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 grid-auto-columns Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
    }

    .grid-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      grid-auto-columns: 100px;
      grid-auto-flow: column;
      grid-template-rows: repeat(2, auto);
      gap: 10px;
      overflow-x: auto;
      padding-bottom: 0.5rem;
    }

    .grid-item {
      background-color: lightblue;
      padding: 20px;
      text-align: center;
      border-radius: 0.35rem;
    }

    .grid-item:nth-child(n+5) {
      background-color: #93c5fd;
    }
  </style>
</head>
<body>
  <h1>Grid Container with Custom Auto Columns</h1>
  <div class="grid-container">
    <div class="grid-item">1</div>
    <div class="grid-item">2</div>
    <div class="grid-item">3</div>
    <div class="grid-item">4</div>
    <div class="grid-item">5</div>
    <div class="grid-item">6</div>
  </div>
</body>
</html>

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CSS grid-auto-columns Property - 100px Columns