Font-Awesome/less/_core.less

// Base Class Definition
// -------------------------

.@{fa-css-prefix}, .fas, .far, .fal, .fad, .fab {
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
  display: inline-block;
  font-style: normal;
  font-variant: normal;
  text-rendering: auto;
  line-height: 1;
}