Align the sidebar dropdown (#3693)

* Align the sidebar dropdown

* Change the sidebar dropdown width and realign it.

* move sidebar dropdown css fix to headers.scss

webapp/sass/layout/_headers.scss

@@ -266,6 +266,10 @@
             }
 
             .dropdown-menu {
+                width: 199px;
+                margin-top: 4px;
+                margin-right: 3px;
+
                 a {
                     overflow: hidden;
                     padding: 3px 20px;