Section Background-Image 100%: Issues

Hello! I am having issues getting to display my background image at 100% height. Here is a url to the page I am having an issue with:

http://evolve2.staging.wpengine.com/evolve-electrical/

The only reason I am doing this is so that I can have button operating over the image. I will attach an image to show what I would like it to look like (image will be different, but bare with me). Can you provide me with some help in this?

Thanks!

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