How to center "Preview Answers" button?

C. This question is regarding "Preview Answers" button, not submit button.

This is because both buttons use the same class to work, this is why you see like the style is only being applied to the submit button, please try injecting this code: 

.form-submit-button {

    width:110px!important;

    margin-left: auto !important;

    margin-right: auto !important;

}

.form-buttons-wrapper {

    margin-left: auto !important;

    margin-right: auto;

}

It should display the button centered, here is the guide to inject the code to your form: How-to-Inject-Custom-CSS-Codes 

If this still does not help, please let us know and we will be glad to further check the code for you. 

Hello sisters7,

On behalf of my colleague, you are welcome.

I am glad to know that your issue is resolved.

Do get back to us if you have any questions.

Thank you!