Hi there evestigio12,
After my rant about “arty-farty” styling nonsense here…
https://www.sitepoint.com/community/t/styling-an-optin-form/248574/2?u=coothead
…I would suggest that you ignore the contents of post #4. 
It would be totally meaningless to anyone on a screen reader.
I have addressed that issue here…
coloured-radio-buttons-improved.zip (39.6 KB)
coothead