Thanks for the response to my question! The video was easy to follow, but the result is not exactly what I am looking for. I am using a Mac, so the best symbol (❚) that I can get does not create a continuous fill. Additionally, my fill areas may be larger than a field, sometimes encompassing many fields at once, so the effect is not very good.
Also, the symbols show up in Filemaker, but not on the website! How do I know if the browser/server is compatible? Please note that I did not set up the server, and am just working with an existing system.
Any other thoughts? I have searched high and low for other approaches, and keep coming up dry, so your help is really appreciated!