Styling
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Basic information
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Styling in Wapanel is made using GTK CSS.

Style fileneeds to be located in `~/.config/wapanel`, `$XDG_CONFIG_HOME/wapanel` or besides executable.

File should be named `wapanel.css`

GTK CSS reference
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+ General overview - https://developer.gnome.org/gtk3/stable/chap-css-overview.html
+ Color names - https://gitlab.gnome.org/GNOME/gtk/-/blob/master/gtk/theme/Adwaita/_colors-public.scss
+ Properties - https://developer.gnome.org/gtk3/stable/chap-css-properties.html

Also, on each GTK widget reference page should be list of CSS nodes.