diff --git a/themes/clean/static/css/clean.css b/themes/clean/static/css/clean.css
index 6cae028..c0f70b1 100644
--- a/themes/clean/static/css/clean.css
+++ b/themes/clean/static/css/clean.css
@@ -3,4 +3,5 @@ html {
 }
 article, hr, footer {
     max-width: 40em;
+    margin: 0 auto;
 }