.love {
--particles: 3;
}
.love span {
animation-delay: calc(20s / var(--particles) * var(--n) * -1);
}
.love span:nth-child(1) {
--n: 1;
}
.love span:nth-child(2) {
--n: 2;
}
.love span:nth-child(3) {
--n: 3;
}this is a css native variable, and the variable name must start with--, otherwise it will be incorrect.
css3 native definition variable
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