Generally, if you stick to the Bootstrap defined classes and variants, there isn't anything you need to do to use a custom theme with React-Bootstrap. It just works. But we also make coloring outside the lines easy to do.
New variants and sizes
Custom variants and sizes should follow the pattern of the default
Bootstrap variants, and define css classes matching:
component-*. React-Bootstrap builds the component
classNames in a consistent way that you can rely on. For
instance this custom
In some cases you may need to change the base class "prefix" of one or
more components. You can control how a component prefixes its classes
locally by changing the
bsPrefix prop or globally via the
Changing prefixes is an escape hatch and generally shouldn't be used.