I have made most use of Koreader and I can describe a little of what you can do, as related to style sheets. Once you have selected a book, you will have menus at the top and bottom of the page. The menus have tabs that change the areas being addressed and normally have a number of selections that lead to option settings.
For style options, the second tab, in the top menu, has "Change font", "Set render style" and "Hyphenation". The "Set render style" selection gives you two pages of .css selections (as well as "clear all external styles" and "Auto") [You swipe the list to change pages.] There is a folder (.kobo\koreader\data) that has the style sheet files. You can add your own and it will appear on the list.
The bottom menu includes a number of things that you might have used a style sheet to implement, as well as the ability to turn "Embedded style" on or off.
There is no pdb.css provided, for instance, and I could make one to use with the many .pdb ebooks that I have, but I like the way it is handled when I select "Auto". I like Auto for .epub sometimes too.
Luck;
Ken
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