None of the themes I’ve tried in ttkthemes will theme the entire window. I apply the theme to the root/self and it will only theme text/buttons

Screenshots:

I was expecting the window to fill the entire way, is there something I’m missing?

Code:

class Window(ThemedTk):
    def __init__(self):
        ThemedTk.__init__(self)

        self.tk.call('lappend', 'auto_path', 'correct_path_to_theme')
        self.tk.call('package', 'require', 'awdark')
        s = ttk.Style()
        s.theme_use("awdark")

        # frame all content will sit inside of
        mainframe = ttk.Frame(self, width=self.width, height=self.height)
        mainframe.pack(side="top", fill="both", expand=True)