diff --git a/theme/static/css/main.css b/theme/static/css/main.css
index 51a9de2..5af0bcf 100644
--- a/theme/static/css/main.css
+++ b/theme/static/css/main.css
@@ -335,3 +335,7 @@ li.tag-4 { font-size: 110%; margin: 0 1em; }
   }
 }
 
+.align-center {
+    display: block;
+    margin: auto;
+}