RADIO-BUTTON in ONE horizonal line (Only problems with theme silvia)

Hey guys,

My Problem: I want my radio buttons be displayed in a horizontal line. Which is normally does by default in all other themes, but not on my current theme. On my theme it shows the radio buttons in vertical lines!
My theme: https://www.ads-software.com/themes/silvia/

My Radio-Buttons example: [radio radio-95 “test1” “test2” “test3” “test4” “test5”]

I want my radio buttons like in thies websites: https://contactform7.com/custom-layout-for-checkboxes-and-radio-buttons/ and https://contactform7.com/checkboxes-radio-buttons-and-menus/
But unfortunately it doesn’t solved my problem.

Also this does not work: [radio radio-95 display:inline “test1” “test2” “test3” “test4” “test5”]

I also read about this from worthdesigning in one post on this website 5 years ago:
span.wpcf7-radio span.wpcf7-list-item { display: inline; }
But where do I put this?

(To use another theme is not possibility for me)
I hope you guys help me.

Best regards,
Raislay

https://www.ads-software.com/plugins/contact-form-7/