Contact Us -> Centres not being shown properly

Requirements for testing : Desktop , Windows 10, chrome Version 81.0.4044.138 64 bit

Steps to reproduce the issue :
* Open the home page - https://codingblocks.com/
* Hover over the "Contact Us" section on right side of the top most nav bar.
* Then, hover over "Centres" section.

The "centres" are not shown properly and it is hidden by the overlayed object containing "contact us" menus.

I have checked by clicking on various parts of hidden layout of centres and it renders properly for centres opening new page for every center but User will not see it and is thereby need to be fixed it.