.show_header {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
}
#show_img_box{
  width: 100%;
  position: absolute;
  top: 0;
}

/* swiper */
.swiper-slide img{
  width: 100%;
  /* height: 100vh; */
  background-size: cover;
}
.swiper-container{
  --swiper-theme-color: #fff;
  --swiper-pagination-color: #fff;/* 两种都可以 */
}
.swiper-pagination-bullet{
  position: relative;
  width: 20px !important;
  height: 20px !important;
}

.side_f{
  transition: all 0.5s;
  box-sizing: border-box;
  position: absolute;
  display: inline-block;
  background-color: #fff;
  border: 3px solid black;
  top:50%;
  margin-top: -8px;
  left: 50%;
  margin-left: -8px;
  border-radius: 50%;
  width: 16px;
  height: 16px;
  -webkit-border-radius: 50%;
  -moz-border-radius: 50%;
  -ms-border-radius: 50%;
  -o-border-radius: 50%;
  -webkit-transition: all 0.5s;
  -moz-transition: all 0.5s;
  -ms-transition: all 0.5s;
  -o-transition: all 0.5s;
}
.bg_img{
  height: 100vh;
  width: 100%;
}
/* http://en.bw0415.cn/img/cphdt01.jpg */
.bg_img{
 
  background-position: 0px center, 0px center;
  background-size: cover;
}
.swiper-slide{
  position: relative;
}
.link_btn {
  box-sizing: border-box;
  position: absolute;
  /* background-color: red; */
  text-align: center;
  width: 360px;
  height: 70px;
  
  border: #fff 1px solid;
  right: 33.5%;
  transition: all 1s;
  -webkit-transition: all 1s;
  -moz-transition: all 1s;
  -ms-transition: all 1s;
  -o-transition: all 1s;
  cursor: pointer;
  z-index: 3;
  bottom: 225px;
  left: 50%;
  margin-left: -180px;
}
.link_btn:hover .link_btn_lyear{
  width: 360px;
}
.link_btn:hover{
  border: 1px solid rgba(245,151,51,0.7);

}
.link_btn_lyear{
  box-sizing: border-box;
  position: absolute;
  text-align: center;
  width: 0;
  height: 70px;
  background-color: rgba(245,151,51,0.7);
  right: 33.5%;
  transition: all 1s;
  -webkit-transition: all 1s;
  -moz-transition: all 1s;
  -ms-transition: all 1s;
  -o-transition: all 1s;
  cursor: pointer;
  top: -1px;
  bottom: 225px;
  left: 50%;
  margin-left: -180px;
}
.link_box{
  z-index: 42;
  position: relative;
}
.link_box span{
  letter-spacing: 3px;
  display: inline-block;
  width: 130px;
  /* margin: 0 auto; */
  top: 20px;
  height: 30px;
  position: relative;
  color: #fff !important;
  font-size: 17px;
  font-family: "Noto Sans SC";
  margin-left: -6px;
  font-weight: 400;
  text-indent: 5px;
}
.link_btn img{
  width: 30px;
  margin-right: 5px;
  /* display: inline-block;
  vertical-align: top;
  z-index: 16;
  width: auto !important;
  margin-top: 10px;
  margin-left:85px; */
}
@media screen and (max-width:768px){
  .link_btn{
    width: 50vw;
    height: 54px;
    right: 25vw;
    bottom: 155px;
    margin-left: 0;
    left: 25vw;
  }
  .link_box span{
    top: 12px;
    font-size: 15px;
  }
}
@media screen and (max-width:320px){
  .link_box span{
    top: 9px;
  }
}