.sinistra{
        position: absolute;
        top: 30%;
        left: 0;
        height: 100px;
        width: 70px;
        }
.immagine{
        position: absolute;
        top: 10%;
        left: 30%;
        height: 500px;
        width: 500px;
        }
.destra{
        position: absolute;
        top: 30%;
        right: 0;
        height: 100px;
        width: 70px;
        }