diff --git a/collects/scribble/racket.css b/collects/scribble/racket.css
index cba6097c6a..bc48085e17 100644
--- a/collects/scribble/racket.css
+++ b/collects/scribble/racket.css
@@ -211,6 +211,7 @@
 .RBackgroundLabel {
    float: right;
    width: 0px;
+   height: 0px;
 }
 
 .RBackgroundLabelInner {