diff --git a/plugins/c9.ide.collab/chat/chat.css b/plugins/c9.ide.collab/chat/chat.css
index 0c0e015d..a9a626ee 100644
--- a/plugins/c9.ide.collab/chat/chat.css
+++ b/plugins/c9.ide.collab/chat/chat.css
@@ -29,6 +29,7 @@
     font-size: @collab-chat-font-size;
     padding: 0 0 0 0;
     background: @collab-chat-background;
+    flex: 1;
 }
 .chatText p {
     padding: @collab-chat-item-padding;