Update style for YARD 0.9

GitHub: fix activeldap/activeldap#147

Reported by jedrekdomanski. Thanks!!!

Author: kou

activeldap.css

@@ -337,23 +337,8 @@ dl.feature-list dd
   padding: 5px 10px;
 }
 
-/* for RDoc */
-body.indexpage,
-body.class,
-body.module,
-body.file
-{
-  margin: 0 !important;
-}
-
-body.indexpage div.content
-{
-  margin: 1em 3em !important;
-}
-
-body.class div.content,
-body.module div.content,
-body.file div.content
+/* for YARD */
+div#main
 {
-  margin: 40px !important;
+  padding: 0 !important;
 }