<!-- Small button group -->
<div class="btn-group">
    <button class="btn btn-danger btn-sm dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
        Small button
    </button>
    <div class="dropdown-menu">
        <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 class="dropdown-divider"></div>
        <a class="dropdown-item" href="#">Separated link</a>
    </div>
</div>

But the dropdown is not working, am i missing something here?