body { background: #111; color: #0f0; font-family: monospace; 
    text-align: center; padding-top: 40px;
}
h1 { font-size: 40px; animation: blink 1s infinite;
}
@keyframes blink { 50% { opacity: 0.4; }
}
.menu { margin-top: 40px;
}
.btn { display: inline-block; margin: 10px; padding: 15px 30px; 
    background: #0f0; color: #000; font-size: 20px; text-decoration: 
    none; border-radius: 8px;
}
.btn:hover { background: #5f5;
}
#leaderboard {
    list-style: none; padding: 0; margin-top: 20px; font-size: 20px;
}