body{font-family:sans-serif;margin:0;padding:0}header{background-color:#333;padding:1rem}nav ul{list-style-type:none;margin:0;padding:0;display:flex;gap:1rem}nav a{color:#fff;text-decoration:none;padding:.5rem 1rem;border-radius:3px}nav a:hover,nav a.active{background-color:#555}main{padding:1rem}