diff -rupN doxygen/templates/html/resize.js /tmp/doxygen/templates/html/resize.js
--- doxygen/templates/html/resize.js	2015-09-20 09:31:10.551310974 +0300
+++ /tmp/doxygen/templates/html/resize.js	2015-09-20 09:46:07.782295495 +0300
@@ -56,7 +56,7 @@ function resizeHeight() 
   var windowHeight = $(window).height() - headerHeight - footerHeight;
   content.css({height:windowHeight + "px"});
   navtree.css({height:windowHeight + "px"});
-  sidenav.css({height:windowHeight + "px",top: headerHeight+"px"});
+  sidenav.css({height:windowHeight + "px"});
 }
 
 function initResizable()
