polygon with bold outline and a semi transperent outline

Idea created by lioriki on Oct 27, 2014
    we need a way that a polygon symbole can have a bold outline and a semi transparent fill.

    to do that I duplicate the layer to two layers.
    one is 40% transparent, and above it the same laye with an outline and no fill at all.
    now it is still bold enough and i can still see what's underneath.


    but the problem with this method is that it is not shown as one layer in the legend.