How to remove side gap in footer

Kindly share website link?

Here is the website I have problem with: https://jacketnyc.com/

Add this to the Additional CSS section of the customizer or style book:

.ast-hfb-header .site-footer {
    padding-bottom: 0;
    padding-left: 0;
    padding-right: 0;
}

Thank you, the issue has been resolved, however is there any other option to resolve it. Like in customization option?

There might be, it depends on the theme. Since you use Astra, I recommend asking in its dedicated support forum where its support staff there are in the best position to answer your question.