html, body {
  width: 100%;
  background-color: #F0F0F0;
  font-family: "Helvetica Neue", Helvetica, Arial, "PingFang SC", "Hiragino Sans GB", "Heiti SC", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif !important;
  font-size: 16px;
  letter-spacing: 1px;
  color: black;
}

#logo {
  position: fixed;
  z-index: 999;
  top: 0.8rem;
  left: 0.8rem;
}

#logo img {
  height: 2rem;
}

.section {
  text-align: center;
}

.section img {
  margin-left: auto;
  margin-right: auto;
  max-width: 100%;
  max-height: 100%;
}

#box-footer {
  position: absolute;
  width: 100%;
  top: 10%;
}

#slogan {
  font-size: 1.2rem;
  margin-top: 0rem;
  margin-bottom: 1rem;
}

#box-qrcode {
  display: block;
  margin-bottom: 4.875rem;
}

.box-qrcode-item {
  margin: 0.5rem;
}

.box-qrcode-item p {
  margin-top: 0.5rem;
  font-size: 0.8rem;
}

.box-qrcode-item .qrcode-item {
  box-sizing: border-box;
  padding: 1rem;
  background-image: url(/images/qrcode-frame.png);
  background-size: 100%;
  height: 10rem;
  width: 10rem;
  margin-left: auto;
  margin-right: auto;
}

.box-qrcode-item .qrcode-item img {
  height: 100%;
  width: 100%;
}

#section-footer {
  font-size: 1rem;
}

footer {
  background-color: #333333;
  color: white;
  position: absolute;
  bottom: 0px;
  width: 100%;
  height: 5rem;
  box-sizing: border-box;
  font-size: 1rem;
}

footer p {
  margin-top: 0px;
}

footer #corp {
  margin-top: 0.8rem;
  margin-bottom: 0.4rem;
  font-size: 0.8rem;
}
footer #copyright, footer #icp {
  margin-bottom: 0.2rem;
  font-size: 0.6rem;
}

@media only screen and (min-width: 641px) {
  #logo {
    position: fixed;
    z-index: 999;
    top: 1.25rem;
    left: 1.25rem;
  }
  #logo img {
    height: 3.875rem;
  }

  #slogan {
    font-size: 2.5rem;
    margin-top: 2.5rem;
    margin-bottom: 2.5rem;
  }

  #box-qrcode {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 4.875rem;
  }

  .box-qrcode-item {
    margin: 3.75rem;
  }

  .box-qrcode-item p {
    margin-top: 0rem;
  }

  .box-qrcode-item .qrcode-item {
    box-sizing: border-box;
    padding: 1.75rem;
    background-image: url(/images/qrcode-frame.png);
    background-size: 100%;
    height: 13.75rem;
    width: 13.75rem;
    margin-left: 0px;
    margin-right: 0px;
  }

  #box-footer {
    position: absolute;
    width: 100%;
    top: 12%;
  }

  footer {
    height: 8rem;
  }
  footer #corp {
    margin-top: 1.8rem;
    margin-bottom: 0.6rem;
    font-size: 1.2rem;
  }
  footer #copyright, footer #icp {
    margin-bottom: 0.2rem;
    font-size: 0.8rem;
  }
}


#btn-down {
  position: absolute;
  bottom: 3.75rem;
  left: 50%;
}

#btn-down a {
  padding-top: 3.75rem;
}

#btn-down a span {
  position: absolute;
  top: 0;
  left: 50%;
  width: 24px;
  height: 24px;
  margin-left: -12px;
  border-left: 1px solid #000;
  border-bottom: 1px solid #000;
  -webkit-transform: rotate(-45deg);
  transform: rotate(-45deg);
  -webkit-animation: sdb 2s infinite;
  animation: sdb 2s infinite;
  box-sizing: border-box;
}
@-webkit-keyframes sdb {
  0% {
    -webkit-transform: rotate(-45deg) translate(0, 0);
  }
  20% {
    -webkit-transform: rotate(-45deg) translate(-10px, 10px);
  }
  40% {
    -webkit-transform: rotate(-45deg) translate(0, 0);
  }
}
@keyframes sdb {
  0% {
    transform: rotate(-45deg) translate(0, 0);
  }
  20% {
    transform: rotate(-45deg) translate(-10px, 10px);
  }
  40% {
    transform: rotate(-45deg) translate(0, 0);
  }
}