body{font-family:Arial;margin:0;background:#111;color:#fff}header{padding:40px;text-align:center;background:#222}h1{color:#f4b400}.btn{background:#f4b400;color:#111;padding:10px 18px;text-decoration:none;border-radius:6px}section{padding:20px}footer{padding:20px;text-align:center;background:#222}