chatview: fix scroll behavior

* auto scroll to end
* align messages to bottom

Change-Id: I85227c5ca53e26c9d50e53c356de46392890b0cf
Reviewed-by: Stepan Salenikovich <stepan.salenikovich@savoirfairelinux.com>
diff --git a/web/chatview.css b/web/chatview.css
index e0e2d63..9beaa65 100644
--- a/web/chatview.css
+++ b/web/chatview.css
@@ -1,4 +1,19 @@
 body {
+  margin: 0;
+}
+
+#container {
+  position: relative;
+  height: 100%;
+  width: 100%;
+}
+
+#messages {
+  position: absolute;
+  bottom: 0;
+  left: 0;
+  max-height: 100%;
+  width: 100%;
   overflow-y: scroll;
 }