Contact Form 7 | NEED HELP WITH INLINE/BLOCK PROBLEME

I need help with a CSS line.
I am configurating a form with Contact Fom 7 but having difficulty.
I have tried everything to do a simple thing. Put a “radio” checkbox Inline instead of block. I want the radio checkbox to be horizontal instead of vertical and i am not really good with coding so i need to do that with a custom CSS line.

Here’s a photo that explains the problem and shows the code :
https://www.atelier-mobile.ca/wp-content/uploads/2016/05/inlineblock.png

and Here’s my page website link :
https://www.atelier-mobile.ca/contact/

Thanks guys