Merge branch 'rs-sign-in-margin' into 'master'

Fix top margin for sign-in button on public pages

Closes #2615

[ci skip]

See merge request !1412

app/assets/stylesheets/generic/common.scss

@@ -302,7 +302,7 @@ table {
 }
 
 .btn-sign-in {
-  margin-top: 15px;
+  margin-top: 8px;
   text-shadow: none;
 }