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 width auto vs fixed Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
      background: #f8fafc;
      color: #334155;
    }

    .demo {
      display: grid;
      gap: 1.5rem;
      max-width: 28rem;
    }

    .label {
      margin: 0 0 0.5rem;
      font-size: 0.875rem;
      font-weight: 600;
      color: #64748b;
    }

    .box {
      padding: 1rem;
      border: 1px solid #cbd5e1;
      border-radius: 0.35rem;
      background: #fff;
    }

    .auto {
      width: auto;
      display: inline-block;
    }

    .fixed {
      width: 160px;
      background: #dbeafe;
    }
  </style>
</head>
<body>
  <h1>auto vs fixed width</h1>
  <div class="demo">
    <div>
      <p class="label">width: auto</p>
      <div class="box auto">Shrinks to content</div>
    </div>
    <div>
      <p class="label">width: 160px</p>
      <div class="box fixed">Fixed width box — text wraps inside.</div>
    </div>
  </div>
</body>
</html>

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CSS width Property - auto vs fixed