a.sbt {
    background:url("/templates/sinclair/images/sml_btn_bg.png") repeat-x;
    display:inline-block;
    height:22px;
    line-height: 22px;
    white-space: nowrap;
    color:#fff;
    text-decoration: none;
    cursor: hand;
}
a.sbt b, a.sbt i{    
    display: block;
    height:22px;
    font-style: normal;
    font-weight: normal;
    cursor: hand;
}
a.sbt b{
    background:url("/templates/sinclair/images/sml_btn_l.png") no-repeat left top;
}
a.sbt i{
    background:url("/templates/sinclair/images/sml_btn_r.png") no-repeat right top;
    padding-left:10px;
    padding-right:10px;
}

<a class="sbt" href="ss"><b><i>Добавить в корзину</i></b></a>

a.sbt {
display:inline-block !important;
}

*  {
margin: 0 ;
padding: 0 ;
}