.wrapper {
  overflow: hidden;
  width: 100%;
  height: 100%;
  position: relative;
}

.wrapper::before {
  content: "";
  position: absolute;
  background: radial-gradient(#fff, transparent, transparent);
  width: 900px;
  opacity: 0.01;
  height: 900px;
  top: var(--y);
  left: var(--x);
  transform: translate(-50%, -50%);
  z-index: 1;
}