How to center login buttons?

Hi. I am having a heck of a time trying to get the [TheChamp-Login] centered on my login page. Have tried in-line style, class, id etc. and nothing seems to work. Using the inspector it appears that the shortcode div has the float-left attribute set and is the reason the icons show left aligned. I also looked in the KB but could not find a way to get things centered? Page is https://mysalsu.org/member-logon.