spacing.scss in sass-zero-1.0.21

- old
+ new

@@ -2,10 +2,10 @@
 // Default spacing scale
 // By default, Tailwind includes a generous and comprehensive numeric spacing scale.
 // Use as padding, margin, width, height, translate, etc...
 // *******************************************************************
 $size-px:  1px;
-$size-0:   0px;
+$size-0:   0rem;
 $size-1:   0.25rem;
 $size-2:   0.5rem;
 $size-3:   0.75rem;
 $size-4:   1rem;
 $size-5:   1.25rem;