How To Use A Different GTK 3 Theme For Specific Applications

This article explains how to apply a different GTK 3 theme to specific applications (a theme other than the global/desktop GTK theme).

So why would you need to set some applications to use a GTK3 theme different than the theme set for your whole desktop? There are cases in which an application doesn't look as it's supposed to / looks broken with a particular theme, but you want to continue using that theme for the other applications on your Linux desktop. Or maybe you prefer to use a particular theme only for one or two applications, while using a different theme for the rest of applications, e.g. you could set text editors to use a dark theme, while using a light theme for all other applications on your desktop.

In this screenshot, Tweaks uses the Mint-Y theme, Nautilus uses Canta theme, Gedit uses Yaru-dark and Eolie web browser (installed from Flathub) uses Plata theme. They are all running in the same time.

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