A fleXible theme for XFCE; it picks up your GTK accent color for the active window border. I have a lot of trouble seeing which window is active without this. I tried to make the active window obvious without being obnoxious.

It looks good with most dark and light GTK themes I've tried so far. I think the accent color that works best depends on your background image/color.

I made the borders fairly thick to ease the resizing via mouse, but the accent color is just 2 pixels thick.

There were many influences on this theme. XFCE's Default theme is one, as is Kokodi and Numix, among others. The kick-in-the-pants that finally got me to make it was MXLinux's mx-comfort-dark theme; I liked the style but I didn't want blue all the time.

Tested on XFCE 4.18 and 4.20. If you spot something wrong, please let me know.

Screenshot is with the GTK theme Adwaita-Orange-Dark