.masked {
    mask: url(#reveal-mask);
    -webkit-mask: url(#reveal-mask);
    -webkit-mask-repeat: no-repeat;
    -webkit-mask-size: 100% 100%;
}

/* <svg width="0" height="0" style="position:absolute;">
  <mask id="reveal-mask" maskUnits="userSpaceOnUse">
    <rect width="100vw" height="100vh" fill="black" />
    <circle id="reveal-circle" fill="white" />
  </mask>
</svg> */