body{font-family:Arial;margin:0;background:#111;color:#eee}header{display:flex;justify-content:space-between;padding:20px;background:#1d4ed8}a{color:#fff;margin:0 8px}.hero{padding:60px;text-align:center}.card{background:#222;padding:20px;border-radius:8px;margin:20px}button{padding:10px 20px}section{max-width:900px;margin:auto;padding:20px}