Add padding at the top of the conversation

Keeps no-scroll-bar conversations from sticking directly to the top of
the window.

FREEBIE

stylesheets/_conversation.scss

@@ -51,7 +51,7 @@
         height: 100%;
         width: 100%;
         margin: 0;
-        padding: 0;
+        padding: 10px 0 0 0;
         overflow-y: overlay;
       }
     }

stylesheets/manifest.css

@@ -1000,7 +1000,7 @@ input.search {
         height: 100%;
         width: 100%;
         margin: 0;
-        padding: 0;
+        padding: 10px 0 0 0;
         overflow-y: overlay; }
 
 .discussion-container {