html {
--s: 50px; /* control the size */
--c1: #0B2E59;
--c2: #0D6759;
background:
conic-gradient(at 25% 25%,#0000 75%,var(--c1) 0) var(--s) var(--s),
repeating-conic-gradient(at 25% 25%,var(--c1) 0 25%,var(--c2) 0 50%);
background-size: calc(2*var(--s)) calc(2*var(--s));
}
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