How to center all the text in the form?

I am trying to center the label alignment and options, but it is not working. There is no center button only left, right, or top. My form is here. 

This should be achieved injecting the following CSS code: 

.form-all, label, th, tr, input {

    text-align: center !important;

}

This guide will help you injecting the code: https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes 

I hope this helps.