Is there a way to style a single button just in the navigation bar?

Site URL: https://www.interjeroakcentai.lt/

Hello, after failing to use successfully ecommerce in squarespace we rebuilt just the store on another platform and want to link as a subdomain from this one, however, the button is a bit too standing out - its ok for the rest of the site but not for navigation bar - is it possible to change the styling so it looks more like the rest of the navigation bar but is in that position - ideally coming before the social links?

Thanks

Hi. You mean change kontakai item to button?

Add to Design > Custom CSS

/* kontakai button */
.header-nav-item [href="/kontaktai"] {
    background: black;
    color: white !important;
    padding: 5px 10px !important;
}