render static font-size if no fluid font-size is available\n      font-size: $rfs-static;\n    }\n    @else {\n      $mq-value: null;\n\n      // RFS breakpoint formatting\n      @if $rfs-breakpoint-unit == em or $rfs-breakpoint-unit == rem {\n        $mq-value: #{$rfs-breakpoint / $rfs-rem-value}#{$rfs-breakpoint-unit};\n      }\n      @else if $rfs-breakpoint-unit == px {\n        $mq-value: #{$rfs-breakpoint}px;\n      }\n      @else {\n        @error \"`#{$rfs-breakpoint-unit}` is not a valid unit...