@mixin font-face($font-family, $svg-font-id, $filepath, $weight: normal, $style: normal) {
  @font-face {
    font-family: $font-family;
    font-style: $style;
    font-weight: $weight;
    src: url('#{$filepath}.eot');
    src: url('#{$filepath}.eot?#iefix') format('embedded-opentype'), // alternative
    url('#{$filepath}.ttf') format('truetype'),
    url('#{$filepath}.svg##{$svg-font-id}') format('svg');
  }
}

a,b,c{color:Red}