.quadro{
    margin-top: 0px;
    margin-bottom: 0px;
    margin-left: 0px;
    margin-right: 0px;
    padding: 0px 0px 0px 0px;
    width: 400px;
    height: 400px;
    color: white;
    background-size: 400px 400px; 
    background-color: transparent;
    border-color: transparent;
    /* background-image: url(../imm/fin2.jpg); */
    background-position: center;
    background-repeat: no-repeat;
}

.quadro:hover{
    color: transparent;
    background-color: transparent;
    border-color: transparent;
    text-decoration: none! important;
}

@media screen and (min-width: 768px) and (max-width: 991px) {
    .quadro{
        width: 300px;
        height: 300px;
        background-size: 300px 300px; 
    }
}

@media screen and (max-width: 767px) {
    .quadro{
        width: 100px;
        height: 100px;
        background-size: 100px 100px; 
    }
}

.testo{
    color: white;
}

.testo:hover{
    color: transparent;
}

.testo_nero{
    color: black;
}