diff --git a/doc/conf.py b/doc/conf.py
index f91ba5d..f4ff748 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -36,6 +36,6 @@
 html_theme_options = {
     'fixed_sidebar': 'true',
     'show_relbar_bottom': 'true',
-    'page_width': '80em',
-    'sidebar_width': '25em'
+    'page_width': '80rem',
+    'sidebar_width': '20rem'
 }