Deprecated css functions

[Marshall Neill <ramien43 windstream net>]

I have a theme that uses

    -GtkWidget-link-color: @theme_link_color;
    -GtkWidget-visited-link-color: #00ffff;

My question is, "What replaces those functions?"
My .xsession-errors file (Xfce user here) is loaded with the errors 
about deprecation.

If a function is deprecated it would be nice to know what is the 
replacement.
I am running with  gtk3.20.8-1 on Arch using a modified vertex theme.
Any help in this request would be greatly appreciated.

Regards,
Marshall Neill