.google {
    width: 300px;
    height: 224px;
    padding: 0px;
}
.google a {
    display: block;

    width: 300px;
    height: 224px;
    overflow: hidden;

    text-decoration: underline;
    text-indent: -10000px;
    
    background: url('mapa.jpg') no-repeat center center;
}