How do I put first and last name on the same line for this form?

Please explain how I can get first and last name fields to appear on the same line on this form.  I have done it on other forms in the past, but this form will not allow me to do it.

First and last name fields are positioned like that because of the Theme that you are using. 

You can add this CSS code to position them in the same line:

[data-type="control_fullname"] .form-sub-label-container {

    width : 48%!important;

}

How to Inject Custom CSS Codes

Hope this will help. 

Thanks - the code worked