body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #000;
    font-family: Arial, sans-serif;
}

.game-container {
    position: relative;
    width: 560px;
    height: 620px;
}

#gameCanvas {
    background-color: #000;
    border: 2px solid #2121DE;
}

#score {
    position: absolute;
    top: -30px;
    left: 0;
    color: #FFFFFF;
    font-family: Arial, sans-serif;
    font-size: 20px;
}

#startMessage {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #FFFFFF;
    font-family: Arial, sans-serif;
    font-size: 24px;
    text-align: center;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.back-button {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 8px 16px;
    background-color: #2121DE;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-family: Arial, sans-serif;
    font-size: 14px;
    transition: background-color 0.3s;
}

.back-button:hover {
    background-color: #1a1a9e;
}