/ navigation styled for Bootstrap 4.0 .container
nav.navbar.navbar-dark.bg-inverse ul.nav.navbar-nav.clearfix li.nav-item button.navbar-toggler.hidden-sm-up.nav-link aria-controls="exCollapsingNavbar2" aria-expanded="false" aria-label=("Toggle navigation") data-target="#exCollapsingNavbar2" data-toggle="collapse" type="button" | ☰ #exCollapsingNavbar2.collapse.navbar-toggleable-xs = link_to "Rails bootstrap", root_path, class: 'navbar-brand' ul.nav.navbar-nav = render 'layouts/navigation_links'