ckbx-style-15 issue with Bulma

[Lesterdor]

Hello @hunzaboy ,
I would like to use your checkboxes. However, I have a problem when I use it together with Bulma (0.9.1)
as you can see on the screenshot:

I've copied the code from your DEMO-Page:

                    <div class="ckbx-style-15">
                        <input type="checkbox" id="ckbx-style-15-1" value="0" name="ckbx-style-15">
                        <label for="ckbx-style-15-1"></label>
                    </div>

As you can see, the 'X' (status false) is unfortunately not fully displayed as can be seen on your Demo page

Do you have an idea for me?

Thanks in advance