<div class="full"></div>

.full {
  position:fixed;
  inset:-80px;
  z-index:969;
  display:flex;
  background:#fff;
  filter: blur(9px) contrast(90) hue-rotate(250deg);
}
.full:before {
  content:"";
  flex:1;
  background:repeating-radial-gradient(circle,#ff00ff 0 20px,#0000 0 40px) ;
  -webkit-mask:
      radial-gradient(farthest-side,#0000 calc(100% - 80px),#000 0 99%,#0000) center/0 0 no-repeat,
      radial-gradient(farthest-side,#0000 calc(100% - 80px),#000 0 99%,#0000) center/0 0 no-repeat,
      linear-gradient(#000b 0 0);
  animation:f 2s infinite linear;
}

@keyframes f {
  33%  {-webkit-mask-size:75vmax 75vmax  ,0             0,auto}
  66%  {-webkit-mask-size:150vmax 150vmax,75vmax   75vmax,auto}
  100% {-webkit-mask-size:150vmax 150vmax,150vmax 150vmax,auto}
}