Adding padding to the navigation, but keeping the site margin set at 0

Site URL: https://viola-turquoise-f66n.squarespace.com/

*the password to view is password*

I need to manually add a little padding to the navigation menu on my site so that the site name is aligned all the way on the left, but I want to keep my site Margin at 0 because throughout the rest of the site I don't want any padding.

Is there a bit of code that would allow me to do this?

In the screen shot you can see how the name "Greg" is all the way to the left.

It appears you already solved this issue?

Let us know if not.

5 hours ago, creedon said:

It appears you already solved this issue?

Let us know if not.

She sent me a message & I gave the code

I did, with code from @tuanphan(below) but now there's a margin on mobile is showing. 

header#header {
    padding-left: 2vw;
    padding-right: 2vw;
}

Can you hide the margin on mobile?

edit code to

@media screen and (min-width:768px) {
header#header {
    padding-left: 2vw;
    padding-right: 2vw;
}
}

That worked on the other pages, but not the one I screen shot. That one is currently a portfolio page I had turned into a 1-column page. 

So here's the code as I have it now:

@media screen and (min-width:768px) 
{
header#header {
    padding-left: 2.5vw;
    padding-right: 2.5vw;
}
}
/* 100% (auto) */

/*5fad6b44253fde48501f2902*/ [class^="portfolio-grid-"] {

  grid-template-columns: auto;
}

Any insight on how to make the 1-column portfolio show up without a margin on mobile?

@media screen and (min-width:768px) {
header#header {
    padding-left: 2vw;
    padding-right: 2vw;
}
}
@media screen and (max-width:767px) {
div#gridThumbs {
    padding-left: 0;
    padding-right: 0;
}
}

@tuanphan, you are my hero. 🙏