As may you aware the default elementary theme have dark themes for the terminal, video player, screenshot app, pitivi and more. If you are looking for how to make the dark apps light to match the rest of the themes this is the place. You can actually set different apps with different themes. First you need a menu editor for this, type in terminal: Code (Text): sudo apt-get install com.github.donadigo.appeditor You will now find the Appeditor in System Tools. Open it. Find eg. the terminal and in command box of it you will add Code (Text): env GTK_THEME=elementary So it will say env GTK_THEME=elementary pantheon-terminal Save it. Find the rest of the dark theme apps and do the exact same thing with them.