blockscout/apps/block_scout_web/assets/css/_elements.scss

hr {
  margin: 2.75em 0;
  border-style: solid;
  border-color: $gray-300 transparent transparent transparent;
}

svg {
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
  display: inline-block;
  font-style: normal;
  font-variant: normal;
  text-rendering: auto;
  line-height: 1;
}