```css
body {
    overflow: hidden;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

canvas {
    display: block;
    margin: 0 auto;
    background-color: #111827;
    border-radius: 0.5rem;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2);
}

.game-container {
    position: relative;
}

.controls {
    position: absolute;
    bottom: 20px;
    width: 100%;
    display: none;
    justify-content: center;
    gap: 10px;
}

@media (max-width: 768px) {
    .controls {
        display: flex;
    }
}
```