diff --git a/docs/apps/334-target-app/problem/app.py b/docs/apps/334-target-app/problem/app.py
index 0e76f9b..3108c15 100644
--- a/docs/apps/334-target-app/problem/app.py
+++ b/docs/apps/334-target-app/problem/app.py
@@ -12,7 +12,7 @@
     theme = app_theme
 )
 
-with ui.sidebar():
+with ui.sidebar(class_="bg-primary-subtle"):
     ui.input_select(
         "account",
         "Account",
diff --git a/docs/exercises/express-310-element-themes/problem/app-solution.py b/docs/exercises/express-310-element-themes/problem/app-solution.py
index 3108c15..27254eb 100644
--- a/docs/exercises/express-310-element-themes/problem/app-solution.py
+++ b/docs/exercises/express-310-element-themes/problem/app-solution.py
@@ -9,7 +9,7 @@
 
 ui.page_opts(
     title="Model scoring dashboard",
-    theme = app_theme
+   # theme = app_theme
 )
 
 with ui.sidebar(class_="bg-primary-subtle"):
diff --git a/docs/exercises/express-310-element-themes/problem/app.py b/docs/exercises/express-310-element-themes/problem/app.py
index 0e76f9b..4924ee4 100644
--- a/docs/exercises/express-310-element-themes/problem/app.py
+++ b/docs/exercises/express-310-element-themes/problem/app.py
@@ -9,7 +9,7 @@
 
 ui.page_opts(
     title="Model scoring dashboard",
-    theme = app_theme
+   # theme = app_theme
 )
 
 with ui.sidebar():
diff --git a/docs/ui-themes-slides.qmd b/docs/ui-themes-slides.qmd
index e3ee2f6..612464a 100644
--- a/docs/ui-themes-slides.qmd
+++ b/docs/ui-themes-slides.qmd
@@ -194,7 +194,7 @@ Assign styles to:
 
 ## Adding CSS to a Shiny app
 
-{{< yourview '315-css' >}}
+{{< yourview '335-css' >}}
 
 ## To link an external style sheet
 
@@ -229,7 +229,7 @@ ui.card_header(
 )
 ```
 
-# Bootstrap classes
+## Bootstrap classes
 
 ::: {.callout-tip}
 Bootstrap provides many predefined CSS classes. These are collections or coordinated style rules, ready to use pass to an element's `class_` parameter.