Missing parts of Bootstrap 4.x
Include bootstrap-extend after bootstrap:
@include './path-to-bootstrap/bootstrap';
@include './path-to-bootstrap-extend/bootstrap-extend'
Without bootstrap, the scss compiler throws an error!
<div class="input-group vertical-input-group">
<div class="input-group">
<span class="input-group-addon">One</span>
<select class="form-control"><option>1</option></select>
</div>
<div class="input-group">
<span class="input-group-addon">One</span>
<select class="form-control"><option>1</option></select>
</div>
</div>
<p class="text-wrap">Wrap me!!!</p>
<div class="w-auto w-xs-25 w-sm-33 w-md-50 w-lg-100"></div>
<div class="h-auto h-xs-25 h-sm-33 h-md-50 h-lg-100"></div>