#div_id_category .controls label .thumbnail {
    background-image: url('../images/sprite.png');
    width: 100px;
    height: 120px;
    border-radius: 6px;
    background-position-y: 0px;
    background-position-x: -190px;
    background-color: transparent;
}

#div_id_category .controls input:checked + label > .thumbnail {
    background-position-y: -116px;
}

#div_id_category .controls label[for=id_category_2] .thumbnail {
    background-position-x: -290px;
}