html,body {
  height: 100%;
  background-image: url(../images/background.png);
  background-size: 100% 100%; /* 拉伸背景图片以填满整个容器 */
  background-repeat: no-repeat; /* 防止背景图片重复 */
  background-position: center center; /* 背景图片居中 */
  margin: 0; /* 移除默认的margin */
}
button {
  height: 40px; width: 100%;
  font-size: x-large;
  margin-top: 13px;
}
.wrap {
  min-height: 100%;

}
.main {

}
.mask-layer {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
}
.browser-open-tip {
  display: none;
  position: absolute;
  z-index: 1000;
  background: rgba(0, 0, 0, 0.75);
}
.uatip {
  background: rgba(0,0,0,0.8);
  text-align: center; position: fixed;
  left:0;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: 998;
  display: none;
}
.polaroid {
  margin: auto;
}
.img{
  width: 124px;
  height: 158px;
  background-image: url("../images/logo.png");
  background-size: cover;
}
.logo {
  width: 124px;
  height: 158px;
  object-fit: cover; /* 保持图片的宽高比 */
}
.btn {
  position: absolute;
  margin-left: 20px;
  margin-right: 20px;
  height: 54px;
  left: 20px;
  right: 20px;
  top: 541px;
  border-radius: 12px;
  background: rgb(237, 25, 31);
  color: white;
  font-size: 18px;
  font-weight: 400;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.btn:hover,.btn:focus {
  background: rgb(237, 25, 31);
  color: white;
}
.download {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.footer {
  position: absolute;
  color: rgb(0, 0, 0);
  font-size: 10px;
  font-weight: 400;
  bottom: 5px;
  text-align: center;
  width: 100%;
  opacity: 0.5;
  .footer-copyright {
    .IPv6-tips {
      color:  rgb(0, 0, 0);
      border: 1px solid  rgb(0, 0, 0);
      border-radius: 8px;
      padding: 0 4px;
      margin: 0 3px;
    }
  }
}

.btn-circle {
  border-radius: 50px;
  box-shadow: 2px 2px 8px 0 rgba(0, 0, 0, 0.2);
}
.id {
  width: 300px;
  margin:0 auto;
}