diff --git a/docs/conf.py b/docs/conf.py
index 146b009..fc96b8b 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -131,8 +131,8 @@
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
 # a list of builtin themes.
-#html_theme = 'bootstrap'
-html_theme = 'classic'
+#html_theme = 'classic'
+html_theme = 'sphinx_rtd_theme'
 
 # Theme options are theme-specific and customize the look and feel of a theme
 # further.  For a list of options available for each theme, see the
@@ -488,3 +488,6 @@
         | parents: :need_outgoing:`{{id}}`
 {% endif -%}
 """
+
+def setup(app):
+    app.add_stylesheet("css/ribbon.css")