@media only screen and (min-width: 960px) {
body.wpex-has-vertical-header #site-header { width: 200px; }
body.wpex-has-vertical-header.full-width-main-layout #wrap { padding-left: 200px }
}
Snippets: Change Vertical Header Style 6 Width
All CSS snippets should be added via a child theme's style.css file or using the built-in Custom CSS panel.