<!-- Topbar + Navbar -->
                    <header>
                      <div class="topbar topbar-dark bg-dark">
                        <div class="container">
                          <!-- Topbar content -->
                        </div>
                      </div>
                    
                      <div class="navbar navbar-expand-lg navbar-light shadow-sm">
                        <div class="container">
                          <!-- Navbar content -->
                        </div>
                      </div>
                    </header>

// Topbar + Navbar
                    header.shadow-sm
                      .topbar.topbar-dark.bg-dark
                        .container
                          //- Topbar content
                    
                      .navbar.navbar-expand-lg.navbar-light
                        .container
                          //- Navbar content