html body .ambient {
  position: fixed; inset: 0; pointer-events: none; z-index: -1;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1600 1000' preserveAspectRatio='xMidYMid slice'%3E%3Crect width='1600' height='1000' fill='%23121110'/%3E%3Cpath d='M-80 720 C 500 760 1050 520 1680 200 L 1680 -80 L -80 -80 Z' fill='%23fff' fill-opacity='.026'/%3E%3Ccircle cx='1430' cy='1130' r='620' fill='%23fff' fill-opacity='.02'/%3E%3C/svg%3E") center / cover no-repeat, #121110;
}