body{font-family:Arial;margin:0;background:#f5f8fc}header{background:linear-gradient(135deg,#2563eb,#22c55e);padding:40px;color:#fff;text-align:center}main{max-width:800px;margin:30px auto;padding:20px;text-align:center}button,a{display:block;margin:15px auto;padding:10px 20px;background:#2563eb;color:#fff;text-decoration:none;border:none;border-radius:25px}