diff --git a/gtk-3.20/scss/_functions.scss b/gtk-3.20/scss/_functions.scss
index 4319c35..16260cd 100755
--- a/gtk-3.20/scss/_functions.scss
+++ b/gtk-3.20/scss/_functions.scss
@@ -86,10 +86,10 @@ $modules: () !default;
     // $bg is the background color
     //
     $_lbg: lightness($bg)/100%;
+
     @if lightness($tc) < 50% {
-        @return transparentize(white, 1-$_lbg/($_lbg*1.3));
-    }
-    @else {
-        @return transparentize(black, $_lbg*0.8);
+        @return transparentize(white, 1 - $_lbg/($_lbg * 1.3));
+    } @else {
+        @return transparentize(black, $_lbg * .8);
     }
 }