body {
  background-image:
    radial-gradient(at 80% -20%, #fff 10%, transparent 40%),
    radial-gradient(at 0% 70%, #fff, transparent 50%),
    radial-gradient(at 0% 0%, #0ff, transparent),
    radial-gradient(at 80% 40%, #ff9, transparent 40%),
    radial-gradient(at 100% 100%, #675ee3, transparent);
  background-attachment: fixed;
}