Extra space in body, cannot use overflow:hidden due to sticky navbar

I found the extra space in right side in body.
I could remove it by adding overflow:hidden, however it will ruin my sticky navbar.

How can I remove extra space in body without adding overflow:hidden?

Thank you for your help in advance.

Here is my site Read-Only: LINK
(how to share your site Read-Only link)

All you should have to do is set a negative margin for however much you want to remove.