[Plugin: Blog Subscription for Jetpack] Customizing Submit Button

I want to update the “submit” button for the blog subscription widget by Jetpack so that the button isn’t as large and parallel to the email box bar, or there is no button at all.

I tried the code on this help forum, and it made the button go down on the next line, partially covering the “featured posts” text: https://www.ads-software.com/support/topic/modifying-the-jetpack-blog-subscriptions-sidebar-widget?replies=5

Any advice on what code to try to achieve this?

https://www.atouchofteal.com