app/views/application/_create_group_button_with_alert.html.erb
<div class="row mt-2rem mb-2rem">
<div class="col-md-12 pl-0 pr-0 text-center">
<% if current_user&.confirmed? %>
<%= link_to "Create group", new_group_path,
class: "btn btn-lg btn-3d btn-primary" %>
<% else %>
<div class="mb-2rem">
<%= create_group_unconfirmed_account_alert %>
</div>
<%= button_tag "Create group", disabled: true,
class: "btn btn-lg btn-3d btn-create-group btn-primary" %>
<% end %>
</div>
</div>