there is no javascript that could be executed...

first part is a CSS style so it should go into custom CSS or custom CSS include if you put it in your custom ccs file.

second part is just a HTML markup for set of radio switches.

it is not OOTB supported to insert own HTML markups into forms.

to put radio switches on form use either choice or lookup controls.

Hi ‌, this needs to be moved (likely) to Getting started, but I do not have the action available in this space.

could you take care?

Hi,

You cannot use the HTML to create Nintex Form, design your Form with Nintex Label and Radio controls, and name them as per your HTML.

Later add the CSS in Custom CSS section of form settings.