body{margin:0;font-family:Arial,sans-serif;background:#f7f7f7;color:#333}.header{background:#222;color:#fff;padding:16px}.header nav a{color:#fff;margin-right:12px;text-decoration:none}.header nav a:hover{text-decoration:underline}.main{padding:24px;min-height:70vh}.footer{text-align:center;padding:16px;background:#eee}