:root {
    --blinkgif: url("/VisionSim/images/blink.gif");
}


#blink {
    position: absolute;
    background-image: var(--blinkgif);
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover, contain;
    background-color: transparent;
    width: 100%;
    height: 100%;
}