html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}
button {
    padding: 10px 20px;
    font-size: 16px;
    cursor: pointer;
}
#error {
    color: red;
    position: fixed;
    top: 10px;
    left: 10px;
    z-index: 10;
}
#loading {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
}
canvas {
    width: 100% !important;
    height: 100% !important;
    display: block;
}