.navigation {
  width: 100%;
  height: 6rem;
  background-image: url('../img/5-about-us/about_banner.jpg');
  background-repeat: no-repeat;
  background-size: cover;
}
.navigation_top {
  height: 0.8rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-right: 1.2rem;
}
.menu_bar {
  display: flex;
  position: relative;
  height: 0.8rem;
}
.menu_bar .menu_bar_item {
  height: 0.8rem;
  margin-right: 0.6rem;
  color: #fff;
  line-height: 0.8rem;
  position: relative;
}
.menu_bar .menu_bar_item .hide_box {
  position: absolute;
  top: 101%;
  left: -0.3rem;
  width: 1.36rem;
  height: 1.29rem;
  background-color: #fff;
  text-align: center;
  font-weight: 400;
  font-size: 0.16rem;
  color: #686868;
  line-height: 0.36rem;
  padding-top: 0.1rem;
  display: none;
}
.menu_bar .menu_bar_item a img {
  margin-top: 0.29rem;
  width: 0.22rem;
  height: 0.22rem;
}
.aircraft {
  font-size: 0.5rem;
  color: #ffffff;
  display: flex;
  justify-content: center;
  margin-top: 1.81rem;
  margin-bottom: 2.07rem;
}
.product_list {
  height: 0.66rem;
 background-color: rgba(25, 24, 24, 0.4);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  opacity: 0.4;
  color: #fff;
}
.product_list .product_introduce {
  display: flex;
  font-size: 0.2rem;
  margin-top: 0.32rem;
  height: 0.66rem;
}
.product_introduce p {
  font-size: 0.2rem;
}
.product_introduce :nth-child(1) a {
  margin-left: 0.37rem;
}
.product_list .location {
  margin-right: 0.5rem;
  font-size: 0.16rem;
}
.product_introduce span {
  margin: 0 0.4rem;
  width: 0.01rem;
  height: 0.4rem;
  background-color: #fff;
}
.development_history {
  padding-bottom: 1.37rem;
  
}
.development_history h4 {
  font-weight: 600;
  font-size: 0.46rem;
  color: #222222;
  margin-top: 1.17rem;
  margin-bottom: 0.73rem;
  text-align: center;
  position: relative;
}
.development_history h4::after{
    content:"development history";
    position: absolute;
    top: -51%;
    left: 50%;
    transform: translateX(-50%);
    font-weight: 600;
    font-size: 0.56rem;
    color: transparent;
    line-height: 0.6rem;
    letter-spacing: 1px;
    text-align: left;
    font-style: normal;
    text-transform: uppercase;
    -webkit-text-stroke: 1px rgba(100, 99, 99, 0.2);
}
.development_history ul {
  display: flex;

}.bannder{
  /*overflow: hidden;*/
}
.carousel{
  border-top: 0.01rem solid #ccc;
  overflow: visible !important;
  padding-bottom: 0.4rem !important;
}
.development_history .bann{
  margin-left: 2.2rem !important;
  overflow: hidden;
  padding-top: 0.2rem;
}
.development_history ul li {
  width: 3rem;
  padding-top: 0.28rem;
  /* border-top: 0.01rem solid #ccc; */
  position: relative;
}
.development_history ul li h5 {
  font-weight: 400;
  font-size: 0.32rem;
  color: #000000;
  margin-bottom: 0.28rem;
}
.development_history ul li p {
  /* width: 2.48rem; */
  font-size: 0.18rem;
  color: #555555;
  margin-bottom: 0.5rem;
}
.development_history ul li img {
  position: absolute;
  top: -0.12rem;
  left: 0rem;
  width: 0.24rem;
  height: 0.24rem;
}
/* .carousel {
  overflow: visible !important;
} */



.development_history .swiper-pagination{
  position: relative;
  width: auto !important;
  height: 100%;
  margin-top: -0.1rem;
}
.development_history .swiper-pagination span{
  width: 0.36rem;
height: 0.02rem;
backgorund: #CCCCCC;
}
.development_history .swiper-pagination .swiper-pagination-bullet-active{
  width: 1.55rem;
height: 0.02rem;
background: #000000;
}
.swiper_box{
  position: relative;
  margin-top: 0.4rem;
  display: flex;
  flex-direction: row;
  justify-content: center;
}
.development_history .swiper-button-next, .development_history .swiper-button-prev{
  width: 0.43rem;
  height: 0.44rem;
  border-radius: 0.25rem 0.25rem 0.25rem 0.25rem;
  border: 0.01rem solid #707070;
  top: auto;
  transform: unset;
  position: relative;
  right: auto;
  left: auto;
}
.development_history .swiper-button-prev{
  margin-left: 0.5rem;
  margin-right: 0.28rem;
}
.development_history .swiper-button-next::after, .development_history .swiper-button-prev::after{
content:'';
background-image: url(../img/5-about-us/but.png);
width: 0.17rem;
height: 0.1rem;
object-fit: contain;

}
.development_history .swiper-button-next::after{
  transform: rotate(180deg);
}



.development_history .swiper_box{
	display: flex;
	align-items: center;
	margin-top: 0px !important;
}


@media screen and (max-width:1024px){
    .navigation{
        height: 3rem;
    }
    .product_list{
        display: none;
    }
    .development_history{
        padding: 15px;
    }
    .development_history .bann{
        margin: 0!important;
    }
    .development_history ul li h5{
        font-size: 16px;
    }
    .development_history ul li p{
        font-size: 14px;
    }
}