body {
    margin: 0;
    padding: 0;
    background: url("background.png") center center / cover no-repeat;
    color: #000000;
}

#app {
    width: 100vw;
    height: 100dvh;
    min-height: -webkit-fill-available;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

canvas {
    display: block;
    box-shadow: 0 0 20px #000;
}