body {
    margin: 0;
    font-family: 'Arial', sans-serif;
    background-color: #000;
    color: #fff;
    text-align: center;
}

#game-container {
    width: 100%;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

#game-screen {
    width: 100%;
    height: 100%;
}

.hidden {
    display: none;
}

canvas {
    background-color: #222;
    display: block;
    margin: 0 auto;
    border: 5px solid #444;
}

#message {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 24px;
    color: #f00;
}

button {
    padding: 10px 20px;
    font-size: 18px;
    background-color: #444;
    color: #fff;
    border: none;
    cursor: pointer;
    border-radius: 5px;
}

button:hover {
    background-color: #666;
}