Removing White Space on Left and Right

I too do not like the white space. In my child theme style.css this works for me:

https://pastebin.com/rwM5fyfK

The css is in the link above – I do not know how to embed the link here.

if you share a screenshot of your site or URL i will check what is the issue actually is

.site-inner {
max-width: 1455.25px;
}
.header-image img {
width: 100%;
}
.site {
margin: 21px;
width: 85%;
margin: auto;
}

Copy the above into the directions below and adjust to your hearts content.

Dashboard > Appearance > Edit CSS