@media (max-width: 991px) {
  #header .mobile-menu-toggle {
    display: block !important;
  }

  #header #main-menu {
    display: none;
  }

  #header #mobile-menu-01.collapse {
    display: none;
  }

  #header #mobile-menu-01.collapse.in {
    display: block;
  }
}