It is built into the theme. Look on Site ADmin under Fordson Theme and adjust the content padding as seen in the pic.
Thank you for your help. However, this is my display and I can't find anything called "Content Padding" you showed. If you know anything, please kindly guide me. Thank you!
You'll want to update the theme then. It's been added to the theme in most recent versions.
All new development is happening on M3.3 so if you have M3.2 you'll need to hard code the CSS using the SCSS Custom box.
You did not state which version of moodle or version of Fordson you are using so I am only guessing.
You can also just hard code it:
#page.container-fluid {padding: 0 2rem!important;}
Problem solved! Thank you very much 