Square White Object Covers Quantity on Shopping Cart

I really like how easy it is to use this Shopping Cart Plugin; however, there’s something odd showing up in image of the cart itself when an item shows up in it. A white box-object covers the Quantity — the column title “Quantity” and a portion of the space where the number (quantity) shows up.

Here’s the webpage where we’re using the shopping cart: https://www.mandalahealingarts.com/fees-and-policies/ To see what I’m talking about, you would, of course need to click on one of the buttons to put something in the cart.

How can I get rid of that white box-object?

Thanks,
Deborah

https://www.ads-software.com/plugins/wordpress-simple-paypal-shopping-cart/