Better button layout on goodby page

templates/default/goodby.html.ep

@@ -4,11 +4,23 @@
 <div class="container-fluid">
   <br/>
   <div class="jumbotron">
-    <h2><%=l 'THANKS_SEE_YOU_SOON' %></h2>
-    <p><%=l 'THANKS_FOR_USING' %></p>
-    <div class='btn-group'>
-      <a class="btn btn-primary btn-lg" role="button" href="<%= $self->get_url('/') %>"><%=l 'BACK_TO_MAIN_MENU' %></a>
-      <a class="btn btn-default btn-lg" role="button" href="<%= $self->get_url('/feedback') %>"><%=l 'GIVE_US_YOUR_FEEDBACK' %></a>
+    <h2>
+      <%=l 'THANKS_SEE_YOU_SOON' %>
+    </h2>
+    <p>
+      <%=l 'THANKS_FOR_USING' %>
+    </p>
+    <div class='row'>
+      <div class="col-sm-6 col-lg-4 col-xl-3">
+        <a class="btn btn-primary btn-lg btn-full" role="button" href="<%= $self->get_url('/') %>">
+          <%=l 'BACK_TO_MAIN_MENU' %>
+        </a>
+      </div>
+      <div class="col-sm-6 col-lg-4 col-xl-3">
+        <a class="btn btn-default btn-lg btn-full" role="button" href="<%= $self->get_url('/feedback') %>">
+          <%=l 'GIVE_US_YOUR_FEEDBACK' %>
+        </a>
+      </div>
     </div>
   </div>
 </div>