body {
    margin: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #000;
    font-family: 'Arial', sans-serif;
    color: #0f0;
}

#gameContainer {
    position: relative;
    width: 400px;
    height: 600px;
    border: 2px solid #0f0;
    border-radius: 15px;
    background-color: #111;
    box-shadow: 0px 0px 20px #0f0;
    display: flex;
    justify-content: center;
    align-items: center;
}

#gameCanvas {
    display: block;
    border-radius: 15px 15px 0 0;
    background-color: #222;
    box-shadow: inset 0px 0px 10px #0f0;
}

#score {
    position: absolute;
    top: 10px;
    left: 10px;
    font-size: 20px;
    color: #0f0;
    text-shadow: 0px 0px 5px #0f0;
}

#startButton {
    margin-top: 20px;
    padding: 10px 20px;
    background-color: #111;
    color: #0f0;
    border: 2px solid #0f0;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    box-shadow: 0px 0px 10px #0f0;
}

#startButton:hover {
    background-color: #0f0;
    color: #111;
    box-shadow: 0px 0px 20px #0f0;
}

#gameOverMessage {
    display: none;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    padding: 20px;
    background-color: #111;
    color: #0f0;
    border: 2px solid #0f0;
    border-radius: 10px;
    font-size: 20px;
    text-align: center;
    box-shadow: 0px 0px 20px #0f0;
    z-index: 10;
}