.boxtestoslide {
    padding-top: 50.625%;
    width: 100%;
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
}
.txt {
    position: absolute;
    left: 50%;
    top: 50%;
    -webkit-transform: translate(-50%,-50%);
    -moz-transform: translate(-50%,-50%);
    transform: translate(-50%,-50%);
    color: #fff;
    text-align: center;
}
h3.testoslide {
    margin: 0 0 32px;
}
.titoloslide h2 {
    text-transform: none;
    margin: 0;
    clear: both;
}
.titoloslide h4 {
    margin: 0 0 10px;
}

@media only screen and (max-width: 991px) {
    .boxtestoslide {
        padding-top: 100%;
    }
}