/* From https://css-tip.com/inner-border/  */
/* Needs testing */
@utility inner-border {
  --offset: 20px; /* offset of the border */
  --border-width: 5px; /* border thickness */
  mask:
    conic-gradient(#000 0 0) no-repeat 50% /
      calc(100% - 2 * (var(--offset) + var(--border-width)))
      calc(100% - 2 * (var(--offset) + var(--border-width))),
    conic-gradient(from 90deg at var(--offset) var(--offset), #0000 25%, #000 0)
      0 0 / calc(100% - var(--offset)) calc(100% - var(--offset));
}