Team member listing – Listing box loop hover color not changeable

Dear,

Currently we are using the ‘Team member listing’ widget with the following settings:
Style: Style 3
Layout: Grid

When a visitor is not hovering over a certain team member, there is a gray bar underneath the team member grid, screenshot: https://ibb.co/ggPnfFQ. However, when hovering over a team member the gray bar changes to red, screenshot: https://ibb.co/0c8zf79

Both the ‘normal’ and the ‘hover’ colors are not editable in the style tab of the ‘Team member listing’ widget. The Box Loop Background style tab does not show any editable options either. How can these colors be changed, since they don’t match our theme.

Looking forward hearing from you, thank you in advance.