Bootstrap icon centeren

 <div class="col-xs-1 col-offset-1">
                <div class="mobile">
                    <a href="tel:0612345678"><span class="glyphicon glyphicon-phone-alt img-responsive" style="font-size:30px;"></span></a>
                </div>
              </div>

.mobile a {
    background-color:#0095db; 
    color:white;  
    text-decoration:none;
    display:block;
    height:60px; 
    color:white;
}