nav - Второстепенная навигационная панель (id=secondnav)
<nav id="secondnav" class="main-header navbar navbar-expand navbar-white navbar-light">
<!-- Left navbar links -->
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link" data-widget="pushmenu" href="#" role="button"><i class="fas fa-bars"></i></a>
</li>
<li class="nav-item d-none d-sm-inline-block">
<a href="index3.html" class="nav-link">Home</a>
</li>
<li class="nav-item d-none d-sm-inline-block">
<a href="#" class="nav-link">Contact</a>
</li>
</ul>
<!-- Right navbar links -->
<ul class="navbar-nav ml-auto">
<li class="nav-item">
<a class="nav-link" data-slide="true" href="#" role="button"><i class="fas fa-phone"></i></a>
</li>
<li class="nav-item">
<a class="nav-link" data-slide="true" href="#" role="button"><i class="fab fa-instagram"></i></a>
</li>
</ul>
</nav>
Стили, которые использованы в части кода
main-header
navbar - Bootstrap class
navbar-expand - Bootstrap class
navbar-white
navbar-light - Bootstrap class