Plugin mailchimp-for-wp, sign-up form, CSS for checkboxes

Hi there!

I’ve installed plugin “mailchimp-fpr-wp”, https://www.ads-software.com/plugins/mailchimp-for-wp/ (version 2.3.16)

After activating the plugin I have configured “Load form styles (CSS)?” as “Yes, load basic form styles”. The “problem” are the checkboxes (their font-color is not white, as the rest of the elements).

You can see the problem visiting:
https://www.applesandideas.es
(scroll down, you will see the widget in the footer, on the left).

So, I would need to change font-color for checkboxes in sign-up form (dark grey by default, and I need them in white).

Could you please let me know what I should do to alter the visual appearance of the checkboxes (group created in Mailchimp, and added in WP as a field). If the answer is “applying some CSS rules to .mc4wp-form”, could you please let me know which file and specific section (line) should be edited? I have tried to add some CSS (“color: white”) in file “mySitewp/content/plugins/mailchimp-for-wp/assets/css/form.css”), section “.mc4wp-form”, but it is not working.

Thanks a lot in advance for your help. Awaiting your feedback.

Kind regards

PS: Not sure if my message has been sent twice. If so, sorry in advance and please accept my apologies.