diff --git a/gdk/broadway/client.html b/gdk/broadway/client.html
index 1f54d068b5..14e61e5770 100644
--- a/gdk/broadway/client.html
+++ b/gdk/broadway/client.html
@@ -19,7 +19,7 @@
 .frame-contents {
     border-radius: 3px;
     -moz-border-radius: 3px;
-    border: 1px solid rgba(0, 0, 0);
+    border: 1px solid rgb(0, 0, 0);
     clear: both;
     position: relative;
 }