#imgDiv{
    background: url("../img/tu1.png") no-repeat;
    background-size: cover;
    z-index: 100;
    opacity:0.5;
    width: 130px;
    height: 50px;
}
#imgDiv1{
    background: url("../img/tu2.png") no-repeat;
    background-size: cover;
    z-index: 100;
    opacity:0.5;
    width: 130px;
    height: 50px;
}