MailChimp Subscribe form text fields too small

I am using Graphene and the problem only manifests in Firefox but the form is basically unusable so this is important. I’ve seen how others have posted they are having the same problem. Apparently Graphene has put cell padding in that Firefox takes literally. 3 different MailChimp support people have chimed in with fixes to over ride the cell padding code that make sense but didn’t work for me. It could be that I don’t really know how to make those patches. I have created a child theme and overrode the padding within that for the mail chimp form using the code provided by mc_kath. That didn’t work. Then I also tried removing the offending line of code from the parent theme and that didn’t work either. Help! I’m at whatididanddoandwhy.com Thanks