html {
--_g: #036564 35%, #0000 36%;
background:
radial-gradient(at 100% 100%, var(--_g)),
radial-gradient(at 0 0 , var(--_g))
#E8DDCB;
background-size: 4em 4em;
/* 35% = 100%/(2*sqrt(2)) */
}
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