diff --git a/converse.css b/converse.css
index 7b57c53ee..5e1f8ea8f 100644
--- a/converse.css
+++ b/converse.css
@@ -592,6 +592,10 @@ dd.available-chatroom:hover a.room-info {
     border-radius: 4px;
 }
 
+.chatbox {
+    width: 200px;
+}
+
 .chatroom {
     width: 300px;
 }