body {
  position: relative;
  overflow: hidden;
  height: 100%;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 10;
}

.header_content {
  margin: 0 auto;
  margin-top: 16px;
  padding: 0 20px;
  max-width: 1340px;
  display: flex;
  align-items: center;
}

.header .logo_img {
  width: 40px;
}

.header .logo_text {
  color: #ffffff;
  font-size: 28px;
  margin-left: 12px
}

.main_block {
  position: absolute;
  width: 100%;
  height: 100%;
  background: #fff url(../image/bg.png) no-repeat center center/cover;

  display: flex;
  flex-direction: column;
}

.main_block .main_content {
  /* color: #ffffff;
  position: absolute;
  top: 200px;
  font-size: 28px;
  width: 100%;
  text-align: center; */

  display: flex;
  flex: 1;
}

.download_block {
  position: absolute;
  top: 300px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  justify-content: center;
  align-items: center;
}

.download_item {
  position: relative;
  width: 150px;
  height: 50px;
  margin: 0 20px;
}

.download_item .download_icon {
  width: 150px;
  height: 50px;
}

.qrcode_block {
  position: absolute;
  top: 65px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px;
  background-color: #ffffff;
  border-radius: 8px;
  transition: all .3s;
  opacity: 0;
}

.qrcode_block::before {
  content: '';
  position: absolute;
  top: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 0px;
  height: 0px;
  border-bottom: 10px solid #ffffff;
  border-left: 10px solid transparent;
  border-right: 10px solid transparent;
}
.download_item:hover .qrcode_block {
  opacity: 1;
}

.qrcode_block .qrcode_img {
  width: 160px;
  height: 160px;
}


@media (max-width: 960px) {
  .header .logo_text {
    font-size: 24px;
  }

  .download_block {
    top: unset;
    bottom: 120px;
  }

  .qrcode_block {
    display: none;
  }
}


.foot {
  padding: 20px;
  background-color: rgba(255,255,255,.04);
  line-height: 24px;
  color: rgba(255,255,255,.75);
}