Background missmatching

Hi, first of all thanks for your pluggin, we are testing the implementation before subscribing for the premium version.
On the dashboard, we can get the shortcode for the membership-checkout [pmpro_checkout] so we can apply it to a page, but we can not edit the form itself. As you can see on the link, the background of 2 of the title options stay white while the text is white too, and we would like to change the background from that area. Is there any css we can apply or somehow we can change that specific zone?

Thanks in advance
Cai

The page I need help with: [log in to see the link]