html,
body {
  margin: 0;
  padding: 0;
}

body {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background: black;
}


/* CSS files add styling rules to your content */

* {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}

#content {
  width: 100vmin;
  height: 100vmin;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

#eye {
  width: calc(100% - 300px);
  height: calc(100% - 300px);
  top: 150px;
  left: 150px;
  margin: 0;
  z-index: 4;
  opacity: 0.8;
  mix-blend-mode:multiply;
}