Theme Element: Product Categories – Carousel

Hi there,
I’m working on the ‘Demo Furniture’ Layout, as like like the product category carousel of its demo homepage. However, when I work on my website, even I edit straight on the demo content, I notice there are a border/shadow outside each product category box now. As you can see, this border/shadow greatly affect the clean look that I chose this demo in the first place. I wonder what changed or how can I achieve a border-less category box?

Thanks,
Hannah