.contenitore {
    height: 50vh;
    position: relative;
    background-color: cadetblue;
}

.contenuto {
    position: absolute;
    background-color: coral;
    padding: 30px;
    left: 50%;
    top: 50%;
    transform: translateX(-50%) translateY(-50%);
    -webkit-transform: translateX(-50%) translateY(-50%);
    -moz-transform: translateX(-50%) translateY(-50%);
    color: white;
    font-weight: bold;
    text-transform: uppercase;
    border: 1px solid white;
}