CSS z-index quandary

Hello,

I have a client website https://www.seleneriverpress.com

Currently, on the home page only, the logo that appears in the upper left corner, disappears after the slideshow (?) loads as if I have a layering problem. This started happening when I messed with the z-index of the tiny shopping cart widget at the upper right corner. However on every other page of the site, everything works correctly in the right layers. Only the home page doesn't like what did, but I can't seem to find a remedy that will leave the other layers intact. Anything I've tried is then dropping the cart under the menu when you expand the cart box.

Any ideas what is going on? I know the css on this site is a mess. So much for Rockettheme/Joomla templates, but I'm so close to having it all working correctly, I'd really appreciate any suggestion to get that logo to pop above all other layers.

Thanks

Bill