Progress bar overlaping menu

Hello how are you?
This is Otávio.

Today I bought the Free Shipping Bar Plugin and I came across a problem.

My website’s menu is fixed. When the free shipping plugin is activated and there is, for example, the phrase “$100 is missing for free shipping” everything works fine.

However, when I add a product to the cart and the progress bar is shown, it sits on top of the menu. On other words, it overlaps the menu.

Pretty much the same issue as seen here:
https://villatheme.com/supports/topic/problem-with-menu-and-free-shipping-bar/
topic #74140

How can I solve this? Thanks.