Constant gtk::STYLE_PROVIDER_PRIORITY_USER

pub const STYLE_PROVIDER_PRIORITY_USER: u32 = ffi::GTK_STYLE_PROVIDER_PRIORITY_USER as u32; // 0x0000_0320u32

The priority used for the style information from XDG_CONFIG_HOME/gtk-3.0/gtk.css.

You should not use priorities higher than this, to give the user the last word.