Email Subscribe like the one in the footer of wpmu.org

Hello,
I am assuming that your email subscription in the footer is your very own "Subscribe By Email". I love how it looks! Can you please tell me how you got the SUMBIT button to go to the same horizontal position as the box where you write your email?
Ive searched through CSS but no like when i manipulate or add things. Id like it to look just like the one here https://premium.wpmudev.org/projects/category/plugins/
PLease help!
Thanks!
Leon