diff --git a/stylesheets/_index.scss b/stylesheets/_index.scss
index 8465a548..df9f497b 100644
--- a/stylesheets/_index.scss
+++ b/stylesheets/_index.scss
@@ -65,6 +65,7 @@
 
 .conversation-header {
   background: $grey_l;
+  border-bottom: solid 1px darken($grey_l, 10%);
 }
 .menu.conversation-menu {
   float: right;
diff --git a/stylesheets/manifest.css b/stylesheets/manifest.css
index 9d5ac033..9143b64f 100644
--- a/stylesheets/manifest.css
+++ b/stylesheets/manifest.css
@@ -394,7 +394,8 @@ img.emoji {
     display: block; }
 
 .conversation-header {
-  background: #f3f3f3; }
+  background: #f3f3f3;
+  border-bottom: solid 1px #d9d9d9; }
 
 .menu.conversation-menu {
   float: right;