canvas {
        max-width: 100%;
        max-height: 100%;
        min-width: 100%;
        min-height: 100%;
        margin: auto;
        overflow: auto;
        position: fixed;
        object-fit: contain;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
}

body {
  background-color: black;
}