html {
--s: 80px;
--_g: radial-gradient(#4d4d4d 45%,#0000 46%);
--_l: radial-gradient(#ffffff 15%,#0000 16%);
background: var(--_l),var(--_l),var(--_g),var(--_g);
background-position: 0 0,var(--s) var(--s);
background-size: calc(2*var(--s)) calc(2*var(--s));
animation:
x 2s cubic-bezier(0.5,92,0.5,-92) infinite,
y 2s cubic-bezier(0.5,92,0.5,-92) infinite -.5s;
/* 92 ~ var(--s)/(1px * 3 * 0.289)
https://css-tricks.com/advanced-css-animation-using-cubic-bezier/
*/
}
@keyframes x {
to {
background-position-x: 1px, calc(var(--s) - 1px),0,var(--s);
}
}
@keyframes y {
to {
background-position-y: 1px, calc(var(--s) - 1px),0,var(--s);
}
}
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