canvas {
    position: fixed;
    top: 0;
    left: 0;
    z-index: -1;
    width: 100%;
    height: 100%;
}

#goldfish-apng {
    position: fixed;
    z-index: -1;
    width: 175px; /* 350 * 0.75 */
    height: 125px; /* 250 * 0.75 */
    display: none; /* Initially hidden */
    pointer-events: none; /* Clicks go through the image */
}