main {
  background: radial-gradient(1200px 600px at 65% 35%, rgba(255,230,0,.18), transparent 55%),
    radial-gradient(900px 500px at 20% 80%, rgba(0,180,255,.18), transparent 60%),
    linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));;
}