Making all pages width pages (80%), not just front page

??Hi
I’m battling to make the pages 80% width like my front page.
I used code this code below which made the front page 80% of full width but the rest of the pages are still too narrow. I’ve spent ages on the forum
Any advice?

This was the code I put into the ‘Additional CSS’ :

/* make full width */
.wrap {
/* margin-left: auto; */
/* margin-right: auto; */
max-width: 100%;
/* padding-left: 2em; */
/* padding-right: 2em; */
}

@media screen and (min-width: 48em) {
.wrap {
max-width: 100%;
/* padding-left: 3em; */
/* padding-right: 3em; */
}
}

.page.page-one-column:not(.twentyseventeen-front-page) #primary {
/*margin-left: auto;*/
/*margin-right: auto;*/
max-width: 100%;
}

@media screen and (min-width: 30em) {
.page-one-column .panel-content .wrap
{
max-width: 90%;
}
}

The page I need help with: [log in to see the link]