#galeria img {
    display: none
}
 
#galeria img.primera {
    display: block
}
 
.pics {
    height:  180px;
    width:   390px;
    padding: 200;
    margin:  0;
}
 
.pics img {
    padding: 15px;
    border:  1px solid #ccc;
    background-color: #eee;
    width:  760px;
    height: 480px;
    top:  0;
    left: 0
}