Fix the bottom bar style across all the resolution

While using the "Design Light" theme in Qt Design Studio, for different resolution the bottom bar effect gets changed, and while trying it at 1920x1080, it doesn't cover the complete bottom area. However in 2560 x 1440 it does cover until the end at times. 

Attaching an image just as an example. Initially I thought this is only for the home page. But, that is true even for the opened project page.