diff --git a/_site.yml b/_site.yml
index 1ce7793..1d1c5c7 100644
--- a/_site.yml
+++ b/_site.yml
@@ -12,7 +12,6 @@ navbar:
 
 output:
   html_document:
-    theme: cosmo
     lib_dir: site_libs
     self_contained: no
     highlight: textmate