Main nav colour not changing after scrolling

on the main page ,after scrolling the background colour of the header bar(Mainnav) dosent change,also there is a problem with scrolling ,
my website didoscounsellingcentre.com
please help me!!!

Hi,

I’ve just checked your site, looks like there is a javascript error occurred on your site which caused the issue. Please try to deactivate “tidioChat” plugin from your site.

Regards,
Awan