body {
  margin: 0;
  height: 100svh;
  width: 100svw;
  overflow: hidden;
  position: relative;
}

#box {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: 99;
  pointer-events: none;
}

video {
  position: absolute;
  outline: none;
  top: 100%;
}

#sun {
  width: 100%;
  height: 100%;
  transition: transform 300ms;
  user-select: none;
}

.mover {
  position: absolute;
  z-index: 99;
  width: 300px;
  height: 300px;
  top: 0;
  left: 0;
  transition: all 2s linear;
  display: none;
}