.ggc_contenido_S {
    color: #F2F255;
    background-image: url(../img/S_G06_U04_L04_02/cont-73.png);
    background-size: 100% 100%;
}

.contenido {
    background-color:aquamarine;
    background-repeat: no-repeat;
    background-size: 100% 100%;
    width: 1228px;
    height: 644px;
    position: absolute;
    left: 50%;
    top: 50%;
    overflow-y: scroll;
    transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
}

.cont1 {
    background-image:url(../img/S_G06_U04_L04_04/cont-76.png);
    background-repeat: no-repeat;
    background-size: 100% 100%;
    width: 1211px;
    height: 900px;
    position: absolute;
    left: 0;
    top: 0;
}