<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>CSS Grid Rows Example</title>
  <style>
    html, body {
      height: 100%;
      margin: 0;
    }

.container {
      display: grid;
      grid-template-rows: 100px auto 1fr;
      height: 100vh;
      background-color: #e8e8e8;
      padding: 10px;
      gap: 10px;
    }

.row {
      padding: 20px;
      color: white;
      font-weight: bold;
      text-align: center;
    }

.row1 { background-color: #ff6b6b; }   /* Fixed 100px */
    .row2 { background-color: #4ecdc4; }   /* Auto height */
    .row3 { background-color: #1a535c; }   /* Flexible */
  </style>
</head>
<body>

<div class="container">
    <div class="row row1">Row 1 (100px)</div>
    <div class="row row2">
      Row 2 (auto height)<br>
      <p>This row grows with content.</p>
    </div>
    <div class="row row3">
      Row 3 (1fr)<br>
      Takes remaining vertical space.
    </div>
  </div>

</body>
</html>