Minor fixes to group visualizations
diff --git a/public/css/vc.css b/public/css/vc.css
index 2b8058c..8c8326f 100644
--- a/public/css/vc.css
+++ b/public/css/vc.css
@@ -30,6 +30,10 @@
   padding: .6em .5em;
 }
 
+.vc .docGroup .docGroup {
+  display: block;
+}
+
 .vc > .docGroup {
   margin-left: 0;
 }