body.home #main-nav-header ul li a.home,
body.idea #main-nav-header ul li a.idea,
body.competencies #main-nav-header ul li a.competencies,
body.partners #main-nav-header ul li a.partners,
body.publications-press #main-nav-header ul li a.publications-press,
body.contact #main-nav-header ul li a.contact {
  background: #000;
}