I also use this theme with a variable width. Maybe I add some settings to change the width to another value and/or a fix width.
I have added the discourse slider (in red) and the logout button.
EDIT:
I removed the loading slider for now but I will “add” it in the near future again.
I have added a few theme settings so you can now upload a background image, set the width of the header, the “container” and the reply control.
Maybe I will add some settings in the future.