How to change the background of the form using radiobutton?

Good night and sorry my english

How i change the background of the form using radiobutton?

for example, depending of the option selected in the radiobutton, the background changes 

option 1 -> background 1

option 2 -> background 2

option 3 -> background 3

A CCS code will help me a lot!

Thanks for read and a special thanks for whos answer!

Unfortunately it is not possible to change the background depending on the selected option using css code. You will need to use javascript to achieve your requirement. I believe the script provided in this guide is suitable for your requirement: https://www.jotform.com/answers/496429. To use the script on your form, you can also check out the additional instructions by my colleague Jonathan here: https://www.jotform.com/answers/865073. 

Please do let us know if you need further assistance.