body {
    margin: 0;
    overflow: hidden;
}
canvas {
    display: block;
}
#joystick-container {
    position: absolute;
    bottom: 50px;
    left: 50px;
    width: 100px;
    height: 100px;
}
#warning-message {
    position: absolute;
    top: 20px;
    width: 100%;
    text-align: center;
    color: red;
    font-size: 24px;
    font-weight: bold;
    display: none;
}