How to select a line from a osm shape by osm_id

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I'm using TileMill to make a map, but I can't seem to be able to format a specific item with a specific osm_id via mss.

I have a shape file added as a layer #line:

Then, in the features list of #line, I can see the different osm_ids:

The problem is how can I format a specific line or element with a specific osm_id via the mss editor.


I tried this to make a very thick boundary lines for the city of Medell

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