.bloqueaX {
    display: none;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    overflow: hidden;
    z-index: 10000;
    position: absolute;
    background-color: #696969;
    opacity: 0.5;
    text-align: center;
}

.centerer {
    display: inline-block;
    vertical-align: middle;
    padding: 25% 0;
}