<nav class="navbar navbar-expand-lg navbar-dark bg-dark fs--1">
  <a class="navbar-brand" href="#">falcon</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarContent1" aria-controls="navbarContent1" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarContent1">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item"><a class="nav-link" href="#">Link</a></li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" id="navbarDropdownComponent" href="#" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</a>
        <div class="dropdown-menu dropdown-menu-right py-0" aria-labelledby="navbarDropdownComponent">
          <div class="bg-white rounded-soft py-2">
            <a class="dropdown-item" href="#">Action</a>
            <a class="dropdown-item" href="#">Another action</a>
            <div class="dropdown-divider"></div>
            <a class="dropdown-item" href="#">Something else here</a>
          </div>
        </div>
      </li>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input class="form-control form-control-sm mr-sm-2" type="search" placeholder="Search" aria-label="Search">
      <button class="btn btn-sm btn-light my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>

<nav class="navbar navbar-expand-lg navbar-dark bg-primary fs--1">
  <a class="navbar-brand" href="#">falcon</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarContent2" aria-controls="navbarContent2" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarContent2">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item"><a class="nav-link" href="#">Link</a></li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" id="navbarDropdown1" href="#" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</a>
        <div class="dropdown-menu dropdown-menu-right py-0" aria-labelledby="navbarDropdown1">
          <div class="bg-white rounded-soft py-2">
            <a class="dropdown-item" href="#">Action</a>
            <a class="dropdown-item" href="#">Another action</a>
            <div class="dropdown-divider"></div>
            <a class="dropdown-item" href="#">Something else here</a>
          </div>
        </div>
      </li>
    </ul>
    <form class="form-inline my-2 my-lg-0">
      <input class="form-control form-control-sm mr-sm-2" type="search" placeholder="Search" aria-label="Search">
      <button class="btn btn-sm btn-light my-2 my-sm-0" type="submit">Search</button>
    </form>
  </div>
</nav>