* change utilities classes.

src/less/basic/utilities.less

@@ -23,13 +23,13 @@
 // Toggling content
 
 .hide      { display: none; }
-.show      { display: block; }
+.showing   { display: block; }
 
 .hidden    { 
   display: none!important;
   visibility: hidden !important;
 }
-.showing   {
+.show      {
   display: block!important;
   visibility: visible !important;
 }