body {
    margin: 0;
    background: linear-gradient(to top, #444 40%, #87ceeb 40%);
    font-family: Arial, sans-serif;
    text-align: center;
    color: white;
}

.game-wrapper {
    padding-top: 20px;
}

canvas {
    background: #555;
    border: 3px solid black;
    display: block;
    margin: 20px auto;
}

.hud {
    font-size: 18px;
    margin-bottom: 10px;
}

#restartBtn {
    padding: 8px 16px;
    font-size: 16px;
    cursor: pointer;
}