diff --git a/lectures/_config.yml b/lectures/_config.yml
index cdd256e..d6999ba 100644
--- a/lectures/_config.yml
+++ b/lectures/_config.yml
@@ -37,6 +37,10 @@ sphinx:
     bibtex_reference_style: author_year
     suppress_warnings: ["mystnb.unknown_mime_type"]
     nb_merge_streams: true
+    # sphinx-proof
+    proof_minimal_theme: true
+    # sphinx-exercise
+    exercise_style: "solution_follow_exercise"
     nb_mime_priority_overrides: [
        # HTML
        ['html', 'application/vnd.jupyter.widget-view+json', 10],