* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: #000;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.game-container {
    position: relative;
    width: 900px;
    height: 700px;
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.1);
    border-radius: 5px;
    overflow: hidden;
}

#gameCanvas {
    background-color: #333;
    width: 100%;
    height: 100%;
}

.game-message {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 48px;
    font-weight: bold;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
    display: none;
}