How to modify current Form Theme to Center the Form

i'd like to let the form be at the center of the page not as you can see on the pic on the right, how can i move it?

You meant like this form http://form.jotformpro.com/form/52677262590967?

Try adding this CSS codes to your form 

.supernova .form-all, .form-all {

float : left !important;

margin-left: 340px;

}

Hope this help. Let us know if you need further assistance.