button {
  border: none;
  outline: none;
  background: transparent;
  padding: 0;
  margin: 0;
  font: inherit;
  color: inherit;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}
#btn-cs {
  display: none;
  position: fixed;
  right: 0.6rem;
  background-color: rgba(114, 193, 60, 0.80);
  color: #fff;
  width: 3.5rem;
  height: 3.5rem;
  text-align: center;
  border-radius: 50%;
  cursor: pointer;
  z-index: 9999;
  left: auto;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  bottom: 16rem;
}
#btn-cs .icon-user-headset {
  font-size: 1.5rem;
  color: #FFFFFF;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
#back-to-top {
  display: none;
  position: fixed;
  right: 0.6rem;
  background-color: rgba(123, 167, 219, 0.80);
  color: #fff;
  width: 3.5rem;
  height: 3.5rem;
  text-align: center;
  border-radius: 50%;
  cursor: pointer;
  z-index: 9999;
  left: auto;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  bottom: 12rem;
}
#back-to-top .icon-AItubiao {
  font-size: 1.2rem;
  color: #FFFFFF;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
/* 回到顶部 默认隐藏 */
.cd-top {
  display: block;
  height: 3.5rem !important;
  width: 3.5rem !important;
  position: fixed;
  bottom: 8rem;
  right: 0.6rem;
  opacity: 0;
  visibility: hidden;
  z-index: 9999;
  cursor: pointer;
  border-radius: 50%;
  text-align: center;
  background-color: rgba(255, 98, 0, 0.80);
  font-size: 14px;
  color: #243558;
}
/* 显示状态 */
.cd-top.cd-is-visible {
  visibility: visible;
  opacity: 1;
}
/* 图标居中 */
.cd-top .icon-icon-top {
  font-size: 1.5rem;
  color: #FFFFFF;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
body::before {
  content: '';
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
  z-index: -999;
  /* 同时预加载3张背景图 */
  background-image:
    url(https://img.xjlsgl.com/d/file/p/9281516ac5496a287a1366d27954e111.jpg?x-oss-process=image/resize,m_fill,w_500,h_320,limit_0/format,webp), url(https://img.xjlsgl.com/d/file/p/5b261be43655b27a99bdc68c9d3b1586.jpg?x-oss-process=image/resize,m_fill,w_500,h_320,limit_0/format,webp), url(https://img.xjlsgl.com/d/file/p/a535858477e468c8d696ede27247aa20.jpg?x-oss-process=image/resize,m_fill,w_500,h_320,limit_0/format,webp);
}