Howdy, @kennyallen!
Thanks for writing in! The white space you are seeing at the bottom of the page is due to the 6em of margin you have applied to the top of your container in your second bar. It would seem you’re using this to offset this container by the height of the first bar to keep things visually centered on the vertical axis. Instead of using margin for this, set the Top Padding value of that container to calc(12.5vw + 6em), and leave the sides and bottom at 12.5vw. The calc() function allows you to combine units that would not otherwise “mix” in CSS, and moving this spacing to the padding of the container will help ensure that this whitespace below the header does not appear.
Hopefully that helps to point you in the right direction. Cheers!