category list hierarchy formatting

not sure if this applies here, but in this electa theme the widget that shows categories (in my case product categories) is a basic vertical list that does not show the hierarchy. such as differentiating the parent from the child usually by a tab space or a bullet point for the child in other themes.
i would like it to look like this:
parent
-child
-child

instead it lists it like this: (boring and not visually easy)
parent
child
child

what css can i add to create the proper hierarchy format?

thanks!