diff --git a/book/_config.yml b/book/_config.yml
index fd4cab6..7ae925d 100644
--- a/book/_config.yml
+++ b/book/_config.yml
@@ -18,6 +18,7 @@ sphinx:
   - teachbooks_sphinx_grasple
   - sphinx_apa_references
   - sphinx_gated_directives
+  - sphinx_sticky_margin
   config:
     language: en
     html_js_files: