Is it possible to add padding to the two radio options on this form?

Please have a look at my form (which is a MailChimp subscription form):

https://www.publictalksoftware.co.uk/newsletter-signup/

The checkboxes have nice padding by default but the radio options do not:

My site is built using Wordpress and I have started to add custom CSS to make the text black:

#mc_embed_signup
{
  color: black;	
}

MailChimp have provided this resource to assist with using CSS with forms but I can't figure out what I am supposed to do to get some padding between the radio options and the texthtml / text.