Kali-Light

Kali-Themes is not available in the Debian repos.

To install this theme set, get the source with the following:

git clone https://gitlab.com/kalilinux/packages/kali-themes
sudo cp -r kali-themes/share/themes/Kali-Light ~/.themes/

Recommendation:

The titlebar will have the Kali dragon emblem on it, which, while it looks pretty cool, can be removed for a “cleaner” look by removing the headerbar png files“

sudo rm /usr/share/themes/Kali-Light/gtk-3.0/assets/kali-headerbar*