body{background:#f4f6f8;margin:0}.container{max-width:800px;margin:50px auto;background:#fff;padding:30px;border-radius:8px;font-family:Arial,sans-serif}button{margin:10px 10px 0 0;padding:10px 16px;border:none;background:#0a66c2;color:#fff;border-radius:4px;cursor:pointer}button:hover{background:#084d94}.nav-buttons{margin-top:20px}