Cannot update the FluentFlipper button styling when using the FluentHorizontalScroll Blazor component

I'm currently using the Fluent UI Blazor library provided by Microsoft.

I'm using the FluentHorizontalScroll component which works very well for what I need it for, but the issue is that this component uses another component FluentFlipper (scroll left/right buttons).

I cannot seem to access any .css styling to update these buttons, because they are nested in the FluentHorizontalScroll component. However, if I create these components individually I can update the styling.

I've tried updating the .css which works for individual component, but not the component within the FluentHorizontalScroll.