.side-nav {
  width: 8.85vw;
  right: -8.85vw;
}
.side-nav ul li .qrcode {
  width: 6.25vw;
  margin: 0 auto 1.04vw;
}
.side-nav ul li img {
  width: 2.92vw;
  margin-bottom: 0.78vw;
}
@media screen and (max-width: 768px) {
  .side-nav {
    width: 110px;
    right: -110px;
  }
  .side-nav ul li .qrcode {
    width: 80%;
    margin: 0 auto 5px;
  }
  .side-nav ul li img {
    width: 20px;
    margin-bottom: 5px;
  }
}