I am learning bootstrap 4 navbar but i was not able to understand clearly how to position objects in navbar i want a search box to be placed at the center of navbar and a button on right but i was only able to do it navbar is not getting aligned at center.
<div class="collapse navbar-collapse text-xs-center" id="mynavbar">
<div class="col-lg-4 form-inline navbar-form">
<div class="input-group">
<form class="form-inline my-lg-0">
<input class="form-control " type="text" placeholder="Search">
<button class="btn btn-outline-default my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</div>
<ul class="navbar-nav w-100 justify-content-end">
<li class="nav-item" style="margin-right: 15px;">
<div class="btn-group">
<a class="btn nav-link dropdown-toggle" data-toggle="dropdown"
href="#" role="button" aria-haspopup="true" aria-expanded="false">
<i class="fa fa-plus" aria-hidden="true"></i>
</a>
<div class="dropdown-menu dropdown-menu-right">
<a class="dropdown-item" href="#">Action</a> <a
class="dropdown-item" href="#">Another action</a> <a
class="dropdown-item" href="#">Something else here</a>
</div>
</div>
</li>
</ul>
</div>