Random white box on page while scrolling and also cannot center slides

Hey guys i set this site up for my friend and its: mizzmay3.com

If you visit the page you can see that when you scroll down, there is a little white rectangle in the middle of the page that when you scroll it goes over the logo, the pictures, and other content as you scroll down the page. I have no idea where it came from and would like to remove it.

I also am using meteor slides for the homepage and for some reason it is not centered and it to the left. When the page first loads it’s centered and then moves to the left.

I really need this fixed as soon as possible before she starts promoting her site so any help will be appreciated. Thanks