body{font-family:Arial;background:#111;color:white;text-align:center}
header{padding:20px;background:#1f1f1f}
.container{max-width:900px;margin:auto}
.game{background:#222;padding:20px;margin:15px;border-radius:12px}
button{padding:10px 20px;border:none;border-radius:8px;cursor:pointer}