Added a email address to report a bugs (#154)

![image](/attachments/d3e81b26-ea63-4ed6-8ae6-b8945325be16)

Co-authored-by: widlam <mikolaj.widla@gmail.com>
Reviewed-on: #154
Co-authored-by: Mikolaj Widla <widlam@noreply.example.com>
Co-committed-by: Mikolaj Widla <widlam@noreply.example.com>

Frontend/assets/css/frame.css

@@ -142,4 +142,9 @@ div#copyright a, a:visited,  a:active {
 #menu a:hover {
     transform: scale(1.25, 1.25);
     transition-duration: .3s;
+}
+
+.separator{
+    width: 100%;
+    padding:6px;
 }