Problem with footer’s responsiveness

Hi,

I’m using child theme of Activello theme: https://colorlib.com/activello/

My website: https://www.biggerthanlimits.com

I added footer manually but there seem to be a problem with its responsiveness. It’s partly responsive but in mobile/tablets etc. view there’s additional width to the right and the footer is placed to the left (in some cases two parts are next to each other and the third part goes down).

Also, when I change the layout of the site or post it goes straight to the sidebar instead to stick to the bottom.

To add footer I used codes from here: https://www.tipsandtricks-hq.com/how-to-add-widgets-to-wordpress-themes-footer-1033

IS there any way to fix it and make it fully responsive? The rest of the site works well.

I would be REALLY grateful for help.

Hope you’re all having a good day.

Anna ??