Fix tab spacing.

frontend/app/css/core/transitions.css

 .transition-color {
-    transition: color .3s linear;
+  transition: color .3s linear;
 }
 .transition-background {
 	transition: background .2s linear;
 }
 .transition-shadow {
-	transition: box-shadow .2s linear;
+  transition: box-shadow .2s linear;
 }
 .transition-all {
-	transition: all .2s linear;
-}
\ No newline at end of file
+  transition: all .2s linear;
+}