// Mixins
 // --------------------------
 
 .fa-icon() {
   -moz-osx-font-smoothing: grayscale;
   -webkit-font-smoothing: antialiased;
   display: inline-block;
   font-style: normal;
   font-variant: normal;
   font-weight: normal;
   line-height: 1;
   vertical-align: -.125em;
 }
 
 .fa-icon-rotate(@degrees, @rotation) {
   -ms-filter: "progid:DXImageTransform.Microsoft.BasicImage(rotation=@{rotation})";
   transform: rotate(@degrees);
 }
 
 .fa-icon-flip(@horiz, @vert, @rotation) {
   -ms-filter: "progid:DXImageTransform.Microsoft.BasicImage(rotation=@{rotation}, mirror=1)";
   transform: scale(@horiz, @vert);
 }
 
 
 // Only display content to screen readers. A la Bootstrap 4.
 //
 // See: http://a11yproject.com/posts/how-to-hide-content/
 
 .sr-only() {
   border: 0;
   clip: rect(0,0,0,0);
   height: 1px;
   margin: -1px;
   overflow: hidden;
   padding: 0;
   position: absolute;
   width: 1px;
 }
 
 // Use in conjunction with .sr-only to only display content when it's focused.
 //
 // Useful for "Skip to main content" links; see http://www.w3.org/TR/2013/NOTE-WCAG20-TECHS-20130905/G1
 //
 // Credit: HTML5 Boilerplate
 
 .sr-only-focusable() {
   &:active,
   &:focus {
     clip: auto;
     height: auto;
     margin: 0;
     overflow: visible;
     position: static;
     width: auto;
   }
 }