.nav {
  width: 100%;
  position: fixed;
  bottom: 0px;
  background-color: #fff;
  z-index: 100;
  text-align: center;
  max-width: 450px;
  left: 50%;
  transform: translate(-50%, 0%);
}

.nav div {
  float: left;
  display: inline-block;
  width: 25%;
  font-size: 20px;
  height: 46px;
  line-height: 18px;
  text-align: center;
  color: #d3cfcf;
  margin-top: 8px;
  font-family: pingfang-jian, uniicons;
}

.nav div span:nth-child(3) {
  font-size: 12px;
}

.top {
  background: #fff;
  z-index: 100;
  width: 100%;
  height: 50px;
  position: fixed;
  max-width: 450px;
  left: 50%;
  transform: translate(-50%, -50%);
  top: 25px;
}

.btn {
  width: 100%;
  border-width: 1px;
  border-color: #e6e6e6;
  border-style: solid;
  border-radius: 5px;
  box-shadow: 0 5px 5px 0 rgb(0 0 0 / 10%);
}

.btn1 {
  width: 100%;
  border-width: 1px;
  border-color: #d3cfcf;
  border-style: solid;
  border-radius: 5px;
  box-shadow: 0 5px 5px 0 rgb(0 0 0 / 10%);
}

.demo .layui-layer-content {
  position: relative;
  text-align: center;
  background-color: green;
  color: #fff;
  word-break: break-all;
  overflow: hidden;
  font-size: 14px;
  overflow-x: hidden;
  overflow-y: auto;
}