Background box disappears when hovering in menu

Hi,

I am currently customizing my company’s website, and have encountered a problem with the roll-down feature in my menubar. It used to be a square with two columns, I deleted unnecessary items and made it a one-column roll-down instead. However, when I hover over the menu items now, the color box behind them shrink into a box that only covers the first two items in the menu.How do I get it to stay behind the text at all times? The title text blends in with the background, so when one is trying to navigate with the menu, you can’t see the text.

https://www.ads-software.com/plugins/menubar/