Identity, not rendering bootstrap css

Question

Hello, 

I'm using Identity framework in my WebCoreApp (AspNetCore 2.1). After scaffolding all methods and views associated with users I use redirect to /Account/Register and Account/Login and these views are ugly as if it didn't include bootstrap css. When I redirect to /Account/Manage/Index this loads very pretty view with all bootstrap css. What and where should I set so that in the views in /Account directory attach bootstrap css?