Oops... I forgot to delete the wrong code provided by one of your colleagues.
The base template looks like the one in the attached video.
Namely, during scrolling, the blocks move from the left to the center of the page.
This effect was put in place once the template and Joomla updates were done.
Originally, the blocks appeared centered on the homepage and DID NOT MOVE during scrolling with the mouse. That's exactly what I want to get back: no more movement of the blocks on the page, just centered!
Thank you for your help.