Hi JSWolf, yeah, agree, will need to spend some time figuring out which element it is in the qss file and make the change accordingly. If you have other suggestions, please do let me know, I am more than eager to try out. Hence my attempt to make the qss-related change. This is more like a Windows problem which doesn't give you an easy way to theme it down to individual widgets, unlike Linux. I read from somewhere that someone manage to change the background color of many applications to dark by changing settings in the registry, but that is a path I don't want to go down. We have the option to change theme to a high contrast theme, which does turn the background of applications dark, but then it makes the color of every other element looks not very pleasant. Background color for taskbars and some other elements do go dark, but not all. after selecting dark mode, the background for programs like notepad, file explorer etc, including Calibre (with interface style set to system default) are still light. It will change certain elements to have a dark background, but not all. It started out as a theme project for Linux distributions but made its way to Windows 10 as well. I am running on the Windows 10 anniversary update (1607) which includes an option to switch it to Dark mode. Currently, the most popular theme for Windows 10. Hi Kovid, setting the interface style to system default in Calibre won't change the background to dark. Those changes are only in my own environment. Hi Zakky, I did it by changing a couple of lines of code in a development environment.

Cool dark themes for windows 10