html {
  --s: 100px; /* control the size */
  --c1: #F8B195;
  --c2: #355C7D;
  
  --_g: 
     var(--c2) 6%  14%,var(--c1) 16% 24%,var(--c2) 26% 34%,var(--c1) 36% 44%,
     var(--c2) 46% 54%,var(--c1) 56% 64%,var(--c2) 66% 74%,var(--c1) 76% 84%,var(--c2) 86% 94%;
  background:
    radial-gradient(100% 100% at 100% 0,var(--c1) 4%,var(--_g),#0008 96%,#0000),
    radial-gradient(100% 100% at 0 100%,#0000, #0008 4%,var(--_g),var(--c1) 96%)
    var(--c1);
  background-size: var(--s) var(--s);
}
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