*{
    margin: 0px;
    padding: 0px;
    background-color: black;
}

nav {
    background-color: #333;
}

.centered {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.zoomSfondo:hover {
    -webkit-transform: scale(1);
    -ms-transform: scale(1);
    transform: scale(1);
}