Widgets can be named, which allows you to refer to them from a
CSS file. You can apply a style to widgets with a particular name
in the CSS file. See the documentation for the CSS syntax (on the
same page as the docs for gtk.StyleContext).
Note that the CSS syntax has certain special characters to delimit
and represent elements in a selector (period, #, >, *...), so using
these will make your widget impossible to match by name. Any combination
of alphanumeric symbols, dashes and underscores will suffice.
Widgets can be named, which allows you to refer to them from a CSS file. You can apply a style to widgets with a particular name in the CSS file. See the documentation for the CSS syntax (on the same page as the docs for gtk.StyleContext).
Note that the CSS syntax has certain special characters to delimit and represent elements in a selector (period, #, >, *...), so using these will make your widget impossible to match by name. Any combination of alphanumeric symbols, dashes and underscores will suffice.