Need to adjust spacing between fields, how do I do it

I am using the full Name quick field and have turned off the middle initial field.  However, when I look at the form there is more space between the First Name and Last Name fields than the other fields.  I have looked in Firebug to try to see what the difference is but the code looks the same for all fields.  Can you point me in the direction to evenly adjust the space between all the fields in the Full Name quick field?

Add this code to your form to adjust the width between the first name label and the first name field:

https://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes

#sublabel_first {
    margin-top : 0px;
    margin-bottom : 2px;
}

That should be the proper spacing.  Adjust the values if necessary.

Here is what the form would look like with the changes made:

https://form.jotform.com/62426522750957