Website damaged when i tried to edit the CSS of my mobile version [closed]

I recently started working on the CSS for my website for my Mobile View.

It used to be perfect on desktop and not the best on mobile but now it's literally the opposite, i have no idea which CSS changed that exactly and it will take so long to search between 4000 CSS codes to find the error.

Please check out how the page looks now on: https://digkeys.org

Does anyone know which specific code did that and how to fix it?

I changed many stuff like the width, height, alignment-text, margin, padding.... I did many edits but i literally don't know which one caused that.

Please please help Thanks