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How to keep a fixed background image centred and responsive

Hello team!

For the project I am currently working on, I am trying to add in some profile photos of the team and style them as fixed positioned background images with a circular shape border.

I would love some help with keeping these images centred in the circle border as well as responsive going down different breakpoints, while still remaining fixed so that there is some movement when scrolling.

These images are located in the ‘About Us’ page under meet the team.
I appreciate your help.

Here is my site Read-Only: