diff --git a/hugo_config/_default/theme_settings.toml b/hugo_config/_default/theme_settings.toml
index e69de29..3a6cd7e 100644
--- a/hugo_config/_default/theme_settings.toml
+++ b/hugo_config/_default/theme_settings.toml
@@ -0,0 +1,2 @@
+[params]
+background_color_class = "bg-blue"