.elementoRelativo {
    width: 100%;
    height: 100%;
    position: relative;
    display: block;
}

.imgTarea {
    background-image: url(../img/M_G07_U03_L03_05/imgTarea.png);
    background-repeat: no-repeat;
    background-size: 100% 100%;
    transform: translate(-50%, -50%);
    -moz-transform: translate(-50%, -50%);
    -ms-transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);
    width: 1136.13px;
    height: 602.13px;
    position: absolute;
    left: 50%;
    top: 50%;
}