stylesheets/_layout.scss in compass-excess-0.3.1 vs stylesheets/_layout.scss in compass-excess-0.4.0

@@ -47,9 +47,14 @@
   @media only screen and (min-width: #{breakpoint($min-width)}) and (max-width: #{breakpoint($max-width) - 1px}) {
     @content;
   }
 } // @mixin between-widths
 
-@mixin desktop-width {
+@mixin desktop-width($margin: 0 auto) {
   max-width: breakpoint(desktop_medium);
-  margin: 0 auto;
+  margin: $margin;
 } // @mixin desktop-width
+
+@mixin auto-width($breakpoint, $margin: 0 auto) {
+  max-width: breakpoint($breakpoint);
+  margin: $margin;
+} // @mixin auto-width