Responsive hero section with flex box

With the just the JPGs to go off of the alignment/space is a little off, but overall I am happy with the layout.

I do have a question regarding the background image. At a certain size/resolution the background image doesn't get bigger and maybe smaller than the viewport. Is there a way to keep the section from growing larger than the image or having the image scale up? If I made the browser window larger, I'd have a gap at the bottom below the bg image showing only the bg color.