html {
  --s: 100px; /* control the size */
  background: 
    linear-gradient(-26.56deg,#4ECDC4 33%,#556270 33.3% 66.6%,#4ECDC4 67%) 
    0/var(--s) var(--s);
  /* 26.56deg = arctan(0.5) */
}
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