Have had a lot of user feedback about choosing a theme

Have had a lot of user feedback about choosing a theme during the create a site process. We have about 20 themes to choose from and quite a few people got confused after selecting a theme -- it's not obvious that you have to scroll down the page to click the submit button.

Suggestions...

* automatically jump to the bottom of the page after selecting a theme so you can instantly see the submit button
* create a pop-up modal saying "theme selected" with the submit button front and center so you can instantly finish the process

Maybe other users have different suggestions? Needs at least one option, but might be good to have several for people to choose from.