body{color:#212529;background:#f8f9fa;margin:0;font-family:Arial,sans-serif}nav{background:#fff;justify-content:space-between;align-items:center;padding:20px;display:flex}nav a{margin-left:15px;font-weight:500;text-decoration:none}section{text-align:center;padding:80px 20px}button{color:#e9ecef;cursor:pointer;background:#212529;border:none;margin-top:20px;padding:12px 20px;transition:all .2s}button:hover{opacity:.75;transform:translateY(-1px)}@media (width<=768px){section{padding:60px 16px}nav{padding:12px 16px}nav h2{font-size:18px}nav button{width:auto;margin-top:0;padding:8px 10px;font-size:13px}}