[Hustle Pro] Need help to remove greyed out background on Hustle Pro Pop Up

Hi there, I have a multisite (domain given), and one of the subsites is https://www.newforestcottagerental.co.uk/ which is currently using Hustle Pro for a pop up. My client doesn't like the greyed out background which appears when the pop up is popped up, covering the screen behind the pop up. How do I get this greyed out opacity to be removed or reduced please? Many thanks in advance!