.btn-group-vertical a.btn wider than .btn-group-vertical button.btn

Created by: MGaetan89

As said in title, when doing this :

<div class="btn-group btn-group-vertical">
    <a class="btn" href="button"><i class="icon-glass"></i></a>
</div>

We get a wider button than with this :

<div class="btn-group btn-group-vertical">
    <button class="btn" type="button"><i class="icon-glass"></i></button>
</div>

Jsfiddle