Unable to position the submit button in center?

Please help me with centering the Submit Button.  I have selected Centered in the design and even with Advanced Designer but the button is still to the left.  Maybe something is wrong with the CSS.

I've checked your live form and I can verify that the Submit button is in "block" mode. Here's a screenshot:

If you want to use the "normal" or "large" mode for the Submit button, then please add this custom CSS code:

.form-submit-button {
margin: 0 auto;
}

Here's the result:

Hope that helps. If you have any questions, let us know.

For some reason on my screen the buttons do not seem centered?

Please try adding the following CSS code: https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes

.qq-upload-button {

    margin-left: -8% !important;

}

Result:

Hope this helps.

The above code works but for some reason, the size of the buttons increases when you click on Preview.  It is smaller in design mode and much larger in preview mode.

DESIGN:

PREVIEW:

Please try adding the !important property to the CSS:

.form-submit-button {
width : 100px !important;
margin : 0 auto !important;
}