body {
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(to bottom, #87CEEB, #C0C0C0);
    font-family: Arial, sans-serif;
}

canvas {
    border: 2px solid #000;
    display: block;
}

.hidden {
    display: none;
}

#gameOverScreen {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(255, 255, 255, 0.8);
    padding: 20px;
    border-radius: 10px;
    text-align: center;
}

#gameOverScreen h1 {
    margin: 0;
}

#restartButton {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
}