app/views/sponsors/_event_sponsor_toast.html.erb
<% if flash[:success] %>
<script type="text/javascript">
Materialize.toast("<%= flash[:success] %>", 4000)
</script>
<% end %>
<% if flash[:error] %>
<script type="text/javascript">
Materialize.toast("<%= flash[:error] %>", 4000)
</script>
<% end %>