On my desktop the taskbar items (on the right hand bottom) show up like this:
On my laptop, also Start11 with taskbar colour RGB: 0,35,66 the items are black (solid)
So, like this
Maybe it is easy, but I vainly searched how to have them, let's say, standout/visible, similar to my desktop taskbar (also Start11).
Trying to accomplish the same as my desktop taskbar.