"Circle Button" window theme. Based from Nightmare
Window border theme for LXDE, LXQT, or Openbox

Thanks to author from Nightmare theme, your theme is included in LXDE
https://www.pling.com/u/maxim2
The reason why i choose Nightmare theme for mod because it's have simple configuration.

CHANGES :
> Close, Iconify, and Max button
> Increased padding of window border
> Borderless and no window handle (bottom extra border)

INSTALLATION :
1. Open the downloaded archive file (Circle-Button-Simple.zip)
2. Extract "Circle-button" folder to Desktop (Don't worry, just for temporarily)
3. Open your Terminal
4. Type this :
sudo mv "Desktop/Circle-button" "/usr/share/themes"
5. Try to logout and login to your computer
6. Enjoy this theme from your appearance settings (Customize Look and Feel)

Tested on Debian 11 LXDE