[Membership 2 Pro] Add option to have submit buttons match theme style

Currently using the Stripe and Paypal integrations makes their "Pay" buttons match the default Stripe and Paypal stylings. Can you please add the option to have those buttons match the theme instead (aka not add the "stripe-button-el" class. I've seen this implemented in WP Simple Pay Stripe (https://wordpress.org/plugins/stripe/) and it works like a charm. Removing the class makes the buttons match the theme. It seems like you guys add a "min-height: 30px" to the span of that button, so that may need to be removed as well...

Would love to see this implemented, as those buttons are the only ones that don't match anything else and (quite frankly look quite out of place).

Thanks!