yasshi2525/RushHour

div#app {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;

    display: flex;
    justify-content: center;
    align-items: center;
}

canvas {
    position: fixed;
    left: 0px;
    top: 0px;
}