Bu kod size yardımcı olacaktır.
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>carlos.1gridtest</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      background-color: #f2f2f2;
      padding: 20px;
    }

    .grid-container {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
      gap: 20px;
    }

    .grid-item {
      width: 150px;
      height: 100px;
      background-color: #e4f1fe;
      border: 1px solid #ccc;
      border-radius: 8px;
      display: flex;
      justify-content: center;
      align-items: center;
      font-size: 16px;
      font-weight: bold;
      color: #333;
      text-transform: uppercase;
    }

    .grid-item.vertical {
      writing-mode: vertical-lr;
      text-orientation: mixed;
    }

    .grid-item.large {
      width: 300px;
      height: 200px;
    }
    .grid-item.small {
      width: 100px;
      height: 80px;
      font-size: 14px;
    }
  </style>
</head>
<body>
  <div class="grid-container">
    <div class="grid-item">150x100</div>
    <div class="grid-item">150x100</div>
    <div class="grid-item">150x100</div>
    <div class="grid-item vertical">100x150</div>
    <div class="grid-item large">300x200</div>
    <div class="grid-item small">100x80</div>
    <div class="grid-item">150x100</div>
    <div class="grid-item vertical">100x150</div>
    <div class="grid-item">150x100</div>
    <div class="grid-item">150x100</div>
    <div class="grid-item small">100x80</div>
  </div>
</body>
</html>