Categories structure not visible in sidebar

[wackydeli]

The hierarchical structure of categories is not visualized in the sidebar.
When using nested categories there is no way of recognizing the parent/child relationships because every category is rendered with the same styles. It would be great if at least "container" type categories (those that are merely "headlines" and cannot contain posts) would have an appearance different from regular categories.
This would be a good start:

li.Heading {
  font-weight: bold;
}

[unixfox]

👍

[gogito]

Nice one

[Marqin]

👍

[kasperisager]

Closing as the project won't receive further updates until the release of Bootstrap 4.