#category_tree .xcat_tree { padding:6px; margin:12px 0 ; }

/* width changes according to the number of cols */
#category_tree .catL1 { float:left; margin:0 0 6px 0; padding:0; width:33%; }
/* when NEXT is set, this is necessary 
   if NEXT option is not set , comment-out this line */
#category_tree .catL2 li { float:left; list-style-type:none; margin:0; padding:0; white-space:nowrap; }