html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}

.canvas {
    width: 100%;
    height: 100%;
}

.invisible {
    display: none;
}

#loadingOverlay {
    position: absolute;
    left: 0;
    top: 0;
    display: table;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
}

#loadingOverlay p {
    display: table-cell;
    text-align: center;
    vertical-align: middle;
    color: white;
    font-size: 200%;
    font-family: Arial, Helvetica, sans-serif;
    font-variant: small-caps;
}

#loadingOverlay img {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    margin: auto;
}