Is it possible to remove/disable ALL Hustle CSS?

I'm using a Hustle widget and need to integrate it into my site's theme, which I already have a design for.

Hustle has built-in styles and an option to override colours, as well as an option for custom CSS.

However, is there a way to completely disable all the built-in styles of Hustle, so no fonts, no sizing, layouts or colours?

I want to be able to style this myself from scratch, just adding to nothing - rather than having to override and disable all the existing Hustle styling which is not only more time consuming, but creates very messy CSS.

Thanks!