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CSS

width: 253px;
height: 262px;
background:
  radial-gradient(circle at 50% 100%, rgba(255,69,127,1) 0%,  50%, rgba(69,168,255,0) 50%) 100px 20px / 129px 77px no-repeat no-repeat, /* Top Right */
  radial-gradient(circle at 50% 100%, rgba(255,69,127,1) 0%,  50%, rgba(69,168,255,0) 50%) 21px 20px / 129px 77px no-repeat no-repeat, /* Top Left */
  radial-gradient(ellipse at 159% 0%, rgba(255,69,127,1) 0%,  50%, rgba(69,168,255,0) 50%) -44px 96px / 170px 205px no-repeat no-repeat, /* Bottom Left */
  radial-gradient(ellipse at -61% 0%, rgba(255,69,127,1) 0%,  50%, rgba(69,168,255,0) 50%) 125px 96px / 170px 205px no-repeat no-repeat; /* Bottom Right */