@media #{$g-breakpoint-tiny} {}
.#{$fa-css-prefix}-glass:before { content: $fa-var-glass; }
a {height: calc(#{$foo} + 1);}
div {
  background: {
      size: auto 60%;
      position: bottom 2px left;
  }
}
a { margin: 0 { left: 10px; } }