Re-position popup need to adjust scrollbar

I have my popup re-positioned with Tyler's help from this thread https://premium.wpmudev.org/forums/topic/i-have-my-popup-positioned-so-it-stays-static-near-the-top#post-814826

As you can see in the attached screenshot I have a scrollbar inside the popup I am trying to get rid of. I thought I was on the right track with css and .wdpu-inner but that doesn't seem to work. Any ideas?