.about_banner_bg {
    background: url(../images/about_banner.png) no-repeat center;
    background-size: cover;
    
}
.container {
    background: #FAFAFA;
    padding: 100px 0;
}
.about_us_list .img_con {
    width: 55%;
}
.about_us_list .text_con {
    width: 45%;
}
.about_us_list .img_con,.about_us_list .text_con {
    font-size: 0;
}
.about_us_list li:nth-child(1) .text_con {
    padding-top: 80px;
}
.about_us_list li:nth-child(2) .text_con {
    position: relative;
    padding: 70px 0 0  100px;
    height: 500px;
    box-sizing: border-box;

}
.about_us_list li>img {
    width: 650px;
}
.about_us_list li .img_con {
    position: relative;
}
.about_us_list li .img_con>img.aboutIcon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
}
.about_us_list li:nth-child(1) .img_con>img.aboutIcon,.about_us_list li:nth-child(3) .img_con>img.aboutIcon {
    left: -18px;
}
.about_us_list li:nth-child(2) .img_con>img.aboutIcon,.about_us_list li:nth-child(4) .img_con>img.aboutIcon {
    right: -18px;
}
.about_us_list li:nth-child(3) .text_con{
    position: relative;
    height: 500px;

}
.about_us_list li:nth-child(4) .text_con{
    position: relative;
    height: 400px;

}
.about_us_list li:nth-child(4) .text_con p {
    color: #808080;
    line-height: 32px;
    font-size: 16px;

}
.about_us_list li:nth-child(2)  .text_con p:nth-child(2) {
    margin-bottom: 50px;
}
.about_us_list li:nth-child(3) .text_con p{
    margin-top: 40px;
    font-size: 24px;
    color: #0F202E;
}
.about_us .introduce_text {
    font-size: 16px;
    color: #808080;
    line-height: 30px;
}
h4.tit {
    display: inline-block;
    font-size: 36px;
    color: #102E2F;
    line-height: 100px;
}
.position {
    position: absolute;
    top: 50%;
    left: 60px;
    transform: translateY(-50%);

}
@media screen and (min-width:960px) and (max-width:1200px){
    h4.tit {
        font-size: 30px;
    }
    h6.sub_tit {
        font-size: 28px;
    }
    .about_us .introduce_text {
        font-size: 14px;
        line-height: 26px
    }
    .about_us_list li:nth-child(2) .text_con {
        padding: 50px 0 0 80px;
    }
    .about_us_list li:nth-child(2) .text_con p:nth-child(2) {
        margin-bottom: 30px;
    }
    .about_us_list li:nth-child(3) .text_con {
        height: 406px;
    }
    .about_us_list li:nth-child(3) .text_con p {
        font-size: 22px;
    }
    .about_us_list li:nth-child(4) .text_con {
        
        height: 348px;
    }
    .about_us_list li:nth-child(4) .text_con p {
        font-size: 18px;
    }
    .about_us_list li:nth-child(2) .text_con {
        height: 406px;
    }

}
@media screen and (min-width:760px) and (max-width:960px){
    h4.tit {
        font-size: 28px;
        line-height: 40px;
    }
    h6.sub_tit {
        font-size: 26px;
        line-height: 34px;
        margin-bottom: 10px;
    }
    .about_us .introduce_text {
        font-size: 12px;
        line-height: 20px
    }
    .about_us_list li:first-child .text_con {
        padding-right: 46px;
    }


    .about_us_list li:nth-child(2) .text_con {
        height: 458px;
    }
    .about_us_list li:nth-child(2) .text_con p {
        font-size: 20px;
    }
    .about_us_list li:nth-child(3) .text_con {
        height: 374px;
    }
    .about_us_list li:nth-child(3) .text_con p {
        font-size: 20px;
    }
    .about_us_list li:nth-child(4) .text_con {
        
        height: 270px;
    }
    .about_us_list li:nth-child(4) .text_con p {
        font-size: 16px;
    }

}

@media screen   and (max-width:760px){
    .container {
        padding: 100px 0 50px;
    }
    h4.tit {
        font-size: 14px;
        line-height: 32px;
    }
    h6.sub_tit {
        font-size: 20px;
        line-height: 30px;
        margin-bottom: 5px;
    }
    .about_us .introduce_text {
        font-size: 12px;
        line-height: 20px
    }
    .about_us_list li:first-child .text_con {
        padding: 0;
        transform: scale(0.9, 0.7);
        margin-top: -120px;
    }
    .position {
        left: 16px;
    }
    .about_us_list li .img_con>img.aboutIcon {
        width: 12px;
    }
    .about_us_list li:nth-child(2) .img_con>img.aboutIcon, .about_us_list li:nth-child(4) .img_con>img.aboutIcon {
        right: -6px;
    }
    .about_us_list li:nth-child(1) .img_con>img.aboutIcon, .about_us_list li:nth-child(3) .img_con>img.aboutIcon {
        left: -6px;
    }
    .about_us_list li:nth-child(2) .text_con {
        height: 200px;
        padding: 0px 0 0 10px;
    }
    .about_us_list li:nth-child(2) .text_con p:nth-child(2) {
        margin-bottom: 20px;
    }
    .about_us_list li:nth-child(2) .text_con p {
        font-size: 12px;
        line-height: 18px;
    }
    .about_us_list li:nth-child(3) .text_con {
        height: 152px;
    }
    .about_us_list li:nth-child(3) .text_con p {
        font-size: 14px;
        margin-top: 20px;
    }
    .about_us_list li:nth-child(4) .text_con {
        
        height: 140px;
    }
    .about_us_list li:nth-child(4) .text_con p {
        font-size: 12px;
        line-height: 20px;
    }

}