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 height auto vs fixed Example</title>

  <style>

    body {

      font-family: system-ui, sans-serif;

      padding: 1.5rem;

      line-height: 1.6;

    }



    .demo {

      display: grid;

      gap: 1.5rem;

      max-width: 22rem;

    }



    .label {

      margin: 0 0 0.5rem;

      font-size: 0.875rem;

      font-weight: 600;

      color: #64748b;

    }



    .box {

      width: 100%;

      padding: 1rem;

      border: 1px solid #cbd5e1;

      border-radius: 0.35rem;

      background: #f8fafc;

    }



    .auto {

      height: auto;

    }



    .fixed {

      height: 120px;

      overflow: auto;

      background: #dbeafe;

    }

  </style>

</head>

<body>

  <h1>auto vs fixed height</h1>

  <div class="demo">

    <div>

      <p class="label">height: auto</p>

      <div class="box auto">

        The browser calculates height from content. This box grows with the text inside it.

      </div>

    </div>

    <div>

      <p class="label">height: 120px</p>

      <div class="box fixed">

        This box has a fixed height. Extra content scrolls inside because overflow is set to auto.

      </div>

    </div>

  </div>

</body>

</html>

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CSS height Property - auto vs fixed