Overriding X-Cart Styles

I am working on a widget for a client that needs to sit on one of his webpages - his website is run on the x-cart system (of which I am not very familiar), and I have found that his template styles are overriding the styles in my widget.

Does anyone know how I can override the template styles in x-cart?

I have tried listing the styles in the head of the webpage like usual, I have tried placing the styles in the actual “style” attribute of the html tags, and I have even tried using JQuery to apply all the styles after the document has initialized. I’m not sure what else to try…

Thanks.