looks great but has a white box in the top left corner on wider monitors

Love the theme, any chance it can be made into a complete theme??? So that all the pages are black instead of white??? I can't find the other theme that I used to be able to use to make the pages black and still be able to use your theme with it.......

It looks pretty good, though it bugs out since I have an ultrawide monitor, so it ends up putting these weird white cuts on part of my screen.