/*---------------------- ↓ 公共标题样式  ------------------------*/
.public_title_box {
  width: 275px;
  margin: 0 auto;
  text-align: center;
}
.public_title {
  font-size: 27px;
  margin: 0 auto 2px;
}
.public_icons {
  width: 153px;
  margin: 0 auto;
}
.public_icons img {
  width: 153px;
}
.public_title_English {
  color: #535252;
  font-size: 13px;
  margin: 0 auto 24px;
}
/*---------------------- ↓ 回到顶部图标  ------------------------*/
#back_top {
  position: fixed;
  bottom: 78px;
  right: 40px;
  font-size: 50px;
  cursor: pointer;
  opacity: 0;
  z-index: -10;
  transition: 0.3s;
  -ms-transition: 0.3s;
  -moz-transition: 0.3s;
  -webkit-transition: 0.3s;
  -o-transition: 0.3s;
}

#tutu_service {
  position: fixed;
  z-index: 999;
  bottom: 70px;
  right: 100px;
}

#tutu_service img {
  width: 100px;
  cursor: pointer;
}