/* --- 容器布局 --- */
.container {
  width: 920px;
  margin: 0 auto;
  height: auto;
  overflow: hidden;
  display: block;
}

/* --- 背景与间距 --- */
.bq_bj {
  background-color: #f3f3f3;
  padding-bottom: 50px;
  border-top: #808080 1px solid;
  margin-top: 70px;
}

/* --- 友情链接栏 --- */
.yq {
  height: 77px;
  border-bottom: #808080 1px solid;
  padding-left: 50px;
}

.yq ul li {
  float: left;
  font-family: "微软雅黑", "黑体";
  font-size: 28px;
  color: #5d5d5d;
  line-height: 77px;
  padding-right: 15px;
}

.yq .li_3 {
  border-left: #808080 1px solid;
  height: 77px;
  width: 4px;
}

/* --- 二维码区域 --- */
.code_box {
  display: flex;
  justify-content: center;
  padding-top: 30px;
}

.wx {
  float: left; /* 兼容性回退 */
  padding: 30px;
  width: 180px;
  height: 180px;
  font-family: "微软雅黑";
  text-align: center;
  font-size: 25px;
}

.wx img {
  width: 100%;
  height: 100%;
}

/* --- 版权声明 --- */
.bq {
  font-family: "微软雅黑", "黑体";
  font-size: 34px;
  color: #151515;
  line-height: 60px;
  text-align: center;
  padding-top: 60px;
}

/* --- 辅助类 --- */
.dscl {
  clear: both;
  height: 0px;
  overflow: hidden;
}

.topbtn {
  width: 101px;
  height: 101px;
  position: fixed;
  right: 10px;
  bottom: 5%;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.2s ease;

}

.topbtn.show {
  opacity: 1;
  visibility: visible;
}