Customize your own GTK3 themes using CSS

Going Advanced with Oomox

Oomox, also known as Themix Designer [4], is a graphical application for generating custom GTK3 themes. Oomox is very easy to use, and it allows inexperienced Linux users to make their own beautiful themes within minutes. The application comes with a collection of presets that differ by color schemes, shape of the UI elements, paddings, and sizes. It is very convenient to pick a preset in Oomox, possibly introduce some changes, and generate a theme. Oomox saves users from any manual routines and automatically generates CSS files, puts them in correct folders, and makes the theme available with no extra effort.

Oomox has three panels: the left-most with a tree of presets and plugins, the central panel with a rather long list of available settings of the currently selected preset/plugin, and the right-most preview panel (Figure 4).

Figure 4: Managing CSS code is easy with a dedicated graphical theme editor.

That said, it is possible to instantly see all theme features without applying the theme for the whole desktop. The list of available theme options includes colors, roundness, gradients, paddings, sizes, links to icon sets, and also special settings for such apps as Gnome Terminal and Spotify.

After playing with a theme's options, hit the Export theme button, define extra GTK3 version-related settings, and finalize the theme. Oomox is a great tool that saves a lot of time for GTK3 theme designers. The tool can create a color palette from an image, create GTK2 assets based on a GTK3 theme, complement your package with Gnome Shell and the Cinnamon theme, and do many other stunning things. And nothing prevents you from examining the resulting CSS code produced by Oomox later on.

The Author

Alexander Tolstoy is a long-time Linux enthusiast and tech journalist. He never stops exploring hot new open source picks and loves writing reviews, tutorials, and various tips and tricks. Sometimes he must face a bitter truth thanks to the inhuman fortune | cowsay command that he thoughtlessly put in ~/.bashrc.

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