width: 500px;
height: 500px;
background:
  repeating-radial-gradient(ellipse at 50% 50%, rgb(173 23 153 / 1) 0%,  2%, rgb(69 228 255 / 1) 4%, rgb(69 228 255 / 1) 4%) 0px 0px / 500px 500px no-repeat no-repeat; /* New Background */