.qrcode_block {
  width: 200px;
  height: 200px;
  position: relative;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}
.qrcode_block img {
  display: none;
}
.qrcode_block .qrcode_canvas {
  position: absolute;
  top: 0;
  left: 0;
}
.qrcode_block .qrcode_logo {
  width: 100%;
  height: 100%;
  z-index: 1;
  background: #fff;
  position: absolute;
  top: 0;
  left: 0;
  -webkit-transform: scale(0.2);
          transform: scale(0.2);
}