#stalker{
    position: fixed;
    transform: translate(-50%,-50%);
    width: 15px;
    height: 15px;
    opacity: 0;
    border-radius: 50%;
    border: solid 1px rgba(255, 255, 255, 0.8);
    pointer-events: none;
    z-index: 1000;
}
body{
    height: 500vh;
}