body{font-family:Arial;background:#fff;margin:0;}header{background:#0077b6;color:#fff;padding:25px;text-align:center;}nav{background:#023e8a;padding:12px;text-align:center;}nav a{color:#fff;margin:8px;text-decoration:none;font-weight:bold;}footer{text-align:center;padding:15px;background:#023e8a;color:white;margin-top:40px;} .container{padding:20px;} img{max-width:100%;border-radius:6px;}