CSS

for the pro version, please contact us direct at the channel listed in the purchase receipt.
But since the question you asked applies to the free version as well…

What have you tried so far?
What CSS do you want to apply?
How are you trying to add the CSS to the printed form?
Are you including the theme style on the printed page?

ok, so let’s look at just one aspect of your theme’s css LI element list-style:

Your theme defines the following:

.gform_wrapper form li, .gform_wrapper li {
    margin-left: 0!important;
    list-style: none!important;
    overflow: visible;
}

However, you are targeting the element: #gform_fields_115 which is inside of the element with a class of .gform_wrapper….

Here are your options:

1. change your print-me target from #gform_fields_115 to .gform_wrapper
2. do some more research on how CSS works, or get assistance from someone that does
3. since you have a pro licence, you are eligible for our next-level pro support. simply contact us in the manner described in your purchase receipt and we will set this up for you

Please let us know if we can be of any further assistance.