@apply and —at-apply

@apply is a way to use utilities inside of normal CSS.

.custom-div {
  @apply text-center my-0 font-medium;
}

--at-apply is basically the same thing but is also vanilla CSS compatible which makes it useful when @apply would give an error. In addition to --at-apply there is also --uno-apply and --uno which are aliases.

.custom-div {
  --at-apply: text-center my-0 font-medium;
}