CSS styling for reCaptcha?

I would really like to change background color for recaptcha dark theme box, but it seems like that i can’t change it in “normal” way, i used class:
.rc-anchor-dark
– with body, !important, pageid and pretty much everything that came to my mind, but background is still black(ish).

I know, that CSS for this box is loaded from external source and it’s all wraped inside iframe but still i would like to know if there’s way to change that background color or anything else from recaptcha box.

https://wordpress.org/plugins/contact-form-7/