How do I format breadcrumb text?

[setishock]

That's a lot of color and contrast changes in the area the breadcrumbs display. Adjusting the font wieght or size would still give you trouble seeing it. I would suggest throwing a light filter behind it.
Download the filter I attached then park it somewhere in your ftp and note the path. I personally just toss it in an album and referance it from there. Makes Lynne chringe when I do that. But for testing you may want to do that first. Then if it works like you want park it in the ftp and change the path.
Ok open your addisional css and add this >

.breadcrumb > ul {
background: url(path/to/your/filter/image);
}

Click save and reload when you have the code like you want it.
I went ahead a uploaded 2 filters in white. One at 50% and the other at 75%. RobbieZ made some colored filters for me and those can be found here > https://vborg.vbsupport.ru/showthread.php?t=268506