Install adwaita-qt by entering the following commands in the terminal:
sudo apt update sudo apt install adwaita-qt
Description:
Qt 5 port of GNOME’s Adwaita theme
Adwaita-Qt provides a port of Adwaita theme, which is the default style of GNOME, to Qt 5. . To use it, start your Qt applications with “-style Adwaita” parameter, or export QT_STYLE_OVERRIDE=Adwaita environment variable. For the dark version, use Adwaita-Dark instead of Adwaita.
Homepage: https://github.com/MartinBriza/adwaita-qt
Version: 1.0-2
Section: universe/gnome