I can't find a way to change the green symbols in the map? There doesn't seem to be a way to do it in the CSS. On the other hand, I was able to change the number to light blue in the panel at least.
Version: 2.9.0
JS API: 3.27
Here's the app: https://webapp.willcountyillinois.com/gisweb/2019_July4th/index.html
You can't, the symbology is a png image.
What is possible, it to set it via the "tab-settings" menu.
Here you can specify a tab-theme-colour, this will also be reflected on the marker.
Note,
If Esri were to have used an svg image instead of a png, then you'd be able to modify the colour via css.
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