Font styles not working

Same issue for me but only for the “Enter Your Email” input.
Another question regarding fonts is:
I would like to be able to use Google Fonts like:
font-family:”Open Sans”,sans-serif !important;

I added in my Custom CSS:
@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,600,700,600italic,400italic,700italic);

and added this line to most of the tags to overide:
font-family:”Open Sans”,sans-serif !important;

Still showing as Helvetica on iPhone and Verdana on Desktop 🙁