body {
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
    background-color: #000;
    aspect-ratio: auto;
    font-family: Roboto, sans-serif;
    font-size: large;
}

#startButton {
    background-color: #000;
    color: #fff;
    border: 2px solid #fff;
    border-radius: 5px;
    cursor: pointer;
    font-size: xxx-large;
    display: none;
    z-index: 1000;
}
#startButton.ready {
    display: block;
    background-color: red;
}
#loadingDiv {
    z-index: 1000;
    color: #fff;
}
#mainDiv {
    position: absolute;
    display: block;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1000;
}

#gameCanvas {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    background: transparent;
}