Is it possible to "kill" all set styles on the bootstrap-vue tabs component?

Question

Bootstrap

Wrote the markup for the step-by-step form. In doing so, I used tabs.
that's what happened

and now this thing needs to be customized like this


, I need to redefine all styles through the parent class, or somehow change the markup of the tab header (it's not clear how to do this), or (in order not to redefine) just somehow reset all classes are styles, but how? I ask the pros for help: how to customize these built-in bootstrap components without too much pain?