Is There A Way To Make Portal Icons Dark?

[Mark_Hotz]

I have been struggling with this for quite a while, so a quick solution would be awesome.

When I build a web-app using Portal for ArcGIS there are quite a few color options from which to choose.  However, I find that if I need to use a light color then it becomes very difficult to see the icons.  Here is an example when the web-app colors are dark:

However, if I choose a light color the icons do not adjust accordingly...they remain light:

We have new corporate colors and I'm currently making changes to our web apps to reflect this, but being able to use dark icons in some cases would really help.

Suggestions?