diff --git a/.travis.yml b/.travis.yml
index cc8237b..d5777e7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,7 +17,7 @@ install:
 
 script: 
   - jekyll build --drafts --profile
-  - html5validator --root _site/ --blacklist r or
+  - html5validator --root _site/ --also-check-css --blacklist r or
 
 env:
   global: