hugo_footnotes.scss

/*

source: https://danielpost.com/articles/making-hugos-footnotes-accessible

*/

@keyframes highlight {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

.footnotes li,
.footnote-ref {
  position: relative;
}

.footnotes li::after,
.single__contents a.footnote-ref::after {
  position: absolute;
  z-index: -1;
  content: '';
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    -100deg,
    rgba(var(--color-footnote-highlight), 0.3),
    rgba(var(--color-footnote-highlight), 0.6) 95%,
    rgba(var(--color-footnote-highlight), 0.1)
  );
  opacity: 0;
}

.footnotes li:target::after,
.footnotes li:focus::after,
sup[id^="fnref"]:target a.footnote-ref::after,
sup[id^="fnref"]:focus a.footnote-ref::after {
  animation: highlight 2s cubic-bezier(0.3, 0, 1, 0.7);
}

.single__contents a.footnote-ref::before {
  content:'';
}

/* readd the correct before/after around the sup instead of the anchor */

sup[id^="fnref"]::before {
  content:'[';
}

sup[id^="fnref"]::after {
  content:']';
}