assets/css/font-awesome/scss/_core.scss
// Base Class Definition
// -------------------------
.#{$fa-css-prefix} {
display: inline-block;
font-family: FontAwesome;
font-style: normal;
font-weight: normal;
line-height: 1;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}