Alignment of @code and @verbatim section

When having a code and a verbatim section the boxes are not alligned, this patch fixes this.
Example code, aa.c; standard Doxyfile:
/** \file

\verbatim
A verbatim part
\endverbatim

\code
A code part
\endcode
*/

src/doxygen.css

@@ -169,8 +169,8 @@ pre.fragment {
 }
 
 div.fragment {
-        padding: 0px;
-        margin: 0px;
+        padding: 4px 6px;
+        margin: 4px 8px 4px 2px;
 	background-color: ##FC;
 	border: 1px solid ##CC;
 }

src/doxygen_css.h

@@ -169,8 +169,8 @@
 "}\n"
 "\n"
 "div.fragment {\n"
-"        padding: 0px;\n"
-"        margin: 0px;\n"
+"        padding: 4px 6px;\n"
+"        margin: 4px 8px 4px 2px;\n"
 "	background-color: ##FC;\n"
 "	border: 1px solid ##CC;\n"
 "}\n"