diff --git a/examples/conf.py b/examples/conf.py
index b69ec2171..43ff9948d 100644
--- a/examples/conf.py
+++ b/examples/conf.py
@@ -154,6 +154,7 @@ def setup(app: Sphinx):
     "sandbox_repo": f"pymc-devs/pymc-sandbox/{version}",
     "doi_url": f"https://doi.org/{doi_code}",
     "doi_code": doi_code,
+    "default_mode": "light",
 }