<div></div>
html, body { display: grid }
html { height: 100% }
div {
--l: bottom,
#fff 20%, #eee 0 40%,
#ddd 0 60%, #ccc 0 80%, #bbb 0;
background:
/* pattern layer */
linear-gradient(90deg, #fff, #808080, #fff)
50%/ 2.5%,
/* map layers */
linear-gradient(to left var(--l)),
linear-gradient(to right var(--l));
background-blend-mode: multiply;
filter: contrast(27)
}
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