adwaita-qt 1.1.1-1build1 (amd64 binary) in ubuntu focal

 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.