Float logo in header

I’ve looked through some previous threads but can’t seem to find a solution that works for me. I am happy with the size of my logo before and after it resizes with scrolling, the only thing I want to change is the vertical alignment of the larger logo to be centered in the space. Once you scroll and the logo becomes smaller, it seems to be centering fine. It is just the large logo that is floating at the top.

Thanks for your help!