If the folder is no longer there, presumably because you reflashed your device, which will have written over the .config directory, then simply create it again.
No need to invoke the devil (aka GAFAM). 
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When I try to re-create .config in the /purism file, he say that âthe name of this file already existâ. And when I search it, it say âno result foundââŠ
Donât recreate the .config folder. Make sure youâre viewing âhiddenâ items in the list of directories and files. Check the main Files menu for âShow hiddenâŠâ Then you should see everything, including hidden directories and files, which all start with . In the Linux file system the . hides the item.
Once inside .config, recreate the gtk-3.0 directory and the script, if they donât already exist.
The .config directory is an inherent part of the file system. The gtk-3.0 directory may or may not be present, dependent on whether youâve created it or not, or some application has created it.
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I think this file should be gtk.css
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And just for clarity, @Marts , the script is pasted into a blank text file, saved and named gtk.css, which is then placed in the folder named gtk-3.0, and then that folder is placed in the .config directory.
Good grief! Everything is okay now. At some point, my finger must have accidentally selected the option to hide this content. 
Thank you so much!
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In more up to date versions of Phosh, wallpapers are supported by default (GNOME-settings). I think in Dawn it should work out of the box without CSS-hacks.
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You want to say, in a near futur or right now? If itâs now, how to update to this version?
PureOS is not up-to-date with recent upstream releases, so you wonât see it there right now. That said, the work is ongoing on making it catch up in some foreseeable future.
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