html {
  --units: 1.5vmax;
  --brick1: #CC0000;
  --brick2: #DD0000;
  --lines: #565656;
  --gp-ln: 50%/calc(var(--units) * 10) calc(var(--units) * 5);
  --gp-cn: 50%/calc(var(--units) * 5) calc(var(--units) * 5);
  height: 100vh;
  background: 
    repeating-conic-gradient(from 90deg at 95% 55%, var(--lines) 0% 25%, #fff0 0% 100%) var(--gp-cn), 
    repeating-linear-gradient(180deg, var(--lines) 0 5%, #fff0 0 50%, var(--lines) 0 55%, var(--brick2) 0 100% ) var(--gp-ln), 
    repeating-linear-gradient(90deg, var(--brick1) 0 47.5%, var(--lines) 0 50%, var(--brick1) 0 97.5%, var(--lines) 0 100% ) var(--gp-ln);
}

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External JavaScript

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