You can add a container wrapping your navbar content …
<nav class="navbar navbar-expand-lg navbar-light sticky-top">
<div class="container">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapse1" aria-controls="collapse1" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div id="collapse1" class="collapse navbar-collapse">
<div class="navbar-nav">
<a class="nav-item nav-link" href="#">Link</a>
<a class="nav-item nav-link" href="#">Link</a>
</div>
</div>
</div>
</nav>