body{font-family:Arial,sans-serif;line-height:1.6;color:#333;margin:0;padding:0;}header{background-color:#f4f4f9;padding:20px;text-align:center;border-bottom:1px solid #ddd;}header h1{font-size:2.5rem;margin:0;color:#333;}nav ul{list-style:none;padding:0;margin:10px 0 0;}nav ul li{display:inline;margin:0 10px;}nav ul li a{text-decoration:none;color:#0077cc;}nav ul li a.active{font-weight:bold;text-decoration:underline;}main{padding:20px;max-width:800px;margin:auto;}main h2{font-size:1.8rem;color:#0077cc;margin-bottom:10px;}main p{font-size:1rem;margin-bottom:15px;}footer{background-color:#f4f4f9;text-align:center;padding:10px 0;border-top:1px solid #ddd;margin-top:30px;}footer p{margin:0;font-size:.9rem;color:#555;}