.zd_logoPoli {
  position: absolute;
  top: 8px;
  left: 0;
  width: 160px;
  background-image: url("https://didattica.polito.it/didattica/assets/png/poli_logo_poli_2021.png");
  background-repeat: no-repeat;
  background-size: contain;
  z-index: 1;
  cursor: pointer;
  height: 40px;
}
@media (min-width: 420px) {
  .zd_logoPoli {
    height: 64px;
  }
}
.zd_logoPoli:focus {
  background-color: transparent;
  -webkit-box-shadow: 0 0 1px 1px #fff;
  -moz-box-shadow: 0 0 1px 1px #fff;
  box-shadow: 0 0 1px 1px #fff;
}