diff --git a/doc/Doxyfile b/doc/Doxyfile
index a6cdc7e65..d474f700a 100644
--- a/doc/Doxyfile
+++ b/doc/Doxyfile
@@ -1430,7 +1430,7 @@ DISABLE_INDEX          = NO
 # The default value is: NO.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-GENERATE_TREEVIEW      = NO
+GENERATE_TREEVIEW      = YES
 
 # The ENUM_VALUES_PER_LINE tag can be used to set the number of enum values that
 # doxygen will group on one line in the generated HTML documentation.
diff --git a/doc/stylesheet.css b/doc/stylesheet.css
index a04b761b6..dd18bbc1b 100644
--- a/doc/stylesheet.css
+++ b/doc/stylesheet.css
@@ -27,6 +27,10 @@ h6 {
 	padding: 0;
 }
 
+#side-nav * {
+	box-sizing: content-box;
+}
+
 /* Original Stylesheet */
 
 h1.groupheader {