How to vertically align navbar-toggler in Bootstrap 4?

I am unable to align the toggler in the navbar. Use Bootstrap 4. Center-align-elements doesn't help.

Code:

<nav class="navbar navbar-toggleable-sm py-3">

    <button class="navbar-toggler navbar-toggler-right collapsed" type="button" data-toggle="collapse" data-target="#navbar">
        <span class="icon-bar"> </span>
        <span class="icon-bar"> </span>
        <span class="icon-bar"> </span>
    </button>

    <a class="navbar-brand d-inline-flex align-items-center" href="#">
        <img src="img/brand-logo.png" class="brand__logo img-fluid mr-2" alt="brand-logo">
        Logo
    </a>

    <div class="collapse navbar-collapse justify-content-end" id="navbar">
        <ul class="navbar-nav">
            <li class="nav-item active">
                <a class="nav-link" href="#">Info</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Login</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Sign Up</a>
            </li>
        </ul>
    </div>
</nav>

      

        
        
        
      

    

Result: example