Issue with modifying search form on twentyten (css issue)

issue: I’m having some trouble locating the correct style that controls the padding thats appearing on my search button. I’m trying to make the button line up with the search bar. I’m hoping someone who is more familiar with this themes css structure will be able to help me locate which value needs adjustment.

url: https://www.anime-geek.net/
style.css: https://pastebin.com/uTFDSXrp
searchform.php: https://pastebin.com/crYD5Frq

If I can provide any additional information please let me know and I appreciate your assistance.