Add list item bullets to Redactor editor textarea

I've noticed that list items in Redactor [v 1.8] editor textareas don't have bullets. I think this is because one of the Perch admin styles says ul {list-style: none;} or the redactor style sheet isn't being applied correctly. Either way, I prefer to see these in the Redactor textareas, so I add the bullets in my own style sheet.

.redactor-editor ul {
    list-style: disc;
}

See this page for how to add your own Perch admin style sheet https://docs.grabaperch.com/docs/customizing-perch/ui-customizations/