.container{max-width:800px;margin:auto;padding:20px;font-family:Arial,sans-serif}.main{background:#f9f9f9;padding:20px;border-radius:8px;box-shadow:0 0 10px rgba(0,0,0,.1)}h1{color:#333;text-align:center}section{margin-bottom:20px}h2{color:#666;border-bottom:1px solid #eee;padding-bottom:10px}p{color:#444;line-height:1.6}@media (max-width:600px){.container,.main{padding:10px}h1{font-size:24px}}