diff --git a/docs/doxygen/folder-open.png b/docs/doxygen/folder-open.png
new file mode 100644
index 0000000..b67403d
--- /dev/null
+++ b/docs/doxygen/folder-open.png
Binary files differ
diff --git a/docs/doxygen/folder.png b/docs/doxygen/folder.png
new file mode 100644
index 0000000..901edc9
--- /dev/null
+++ b/docs/doxygen/folder.png
Binary files differ
diff --git a/docs/doxygen/text-x-generic.png b/docs/doxygen/text-x-generic.png
new file mode 100644
index 0000000..2d7f2d6
--- /dev/null
+++ b/docs/doxygen/text-x-generic.png
Binary files differ
diff --git a/doxygen.cfg.in b/doxygen.cfg.in
index 3f006a3..b92f9d2 100644
--- a/doxygen.cfg.in
+++ b/doxygen.cfg.in
@@ -1159,7 +1159,8 @@
 # list). For an example see the documentation.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_EXTRA_STYLESHEET  =
+HTML_EXTRA_STYLESHEET  = \
+	docs/doxygen/custom.css
 
 # The HTML_EXTRA_FILES tag can be used to specify one or more extra images or
 # other source files which should be copied to the HTML output directory. Note
@@ -1169,7 +1170,10 @@
 # files will be copied as-is; there are no commands or markers available.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-HTML_EXTRA_FILES       =
+HTML_EXTRA_FILES       = \
+	docs/doxygen/folder.png \
+	docs/doxygen/folder-open.png \
+	docs/doxygen/text-x-generic.png
 
 # The HTML_COLORSTYLE_HUE tag controls the color of the HTML output. Doxygen
 # will adjust the colors in the style sheet and background images according to