How to solve back and next buttons overlap problem in preview mode?

The "next" and "back" buttons at the bottom of the page overlap when I preview my form.

I have controlled your form. Please inject the css code below and it will be done. 

Please let us know if you need any help. 

.form-pagebreak-back-container {

    margin-left: 0% !important;

}

.form-pagebreak-next-container {

    margin-left: 10% !important;

}