Complete improvements for [Night mode](https://bitbucket.org/dismine/valentina/issues/691/new-feature-night-mode). [How to add a dark theme to your Qt application](https://successfulsoftware.net/2021/03/31/how-to-add-a-dark-theme-to-your-qt-application/) Approach in this [project](https://github.com/paceholder/nodeeditor) maybe useful for us. **Update.** New release of [QDarkStyleSheet](https://github.com/ColinDuquesnoy/QDarkStyleSheet/releases/tag/v3.0.2)