Colors in tooltips

I'm developing an application in Gnome using GTK3 + Glade 
I would change the background and the foreground of my tooltips.
Please, if possible, could you report a css file that implements this function?
 I googled and tried a lot of suggestions without success.
Thank you so much for your help

I do not know if this is the right mailing list for those who want to develop applications using gtk3 in Gnome. If not, please could you suggest the right mailing list.
Thank you Again

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