.ban_box{
    width: 100%;
    position: relative;

}
.ban_box img{
    width: 100%;
}
.meng{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #000;
    opacity: 0.3;
}
.ab_us{
    position: absolute;
    bottom: 130px;
    left: 100px;
    font-size: 46px;
    font-weight: 600;
    color: #fff;
}
.b1_box{
    margin: 50px 0;
    padding: 0 100px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    gap: 30px;
}
.b1_list{
    display: flex;
    gap: 40px;
    align-items: center;
}
.b1_list img{
    width: 240px;
    height: 240px;
}
.li_re{
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 30px;
    color: #000;
}
.li_re :nth-child(1){
    font-size: 24px;
    font-weight: 600;
}
.li_re :nth-child(2){
    line-height: 30px;
}

@media (max-width: 768px){
    .ab_us{
        left: 30px !important;
        bottom: 30px !important;
        font-size: 20px !important;

    }
    .b1_box{
        padding: 10px !important;
    }
    .b1_list{
        flex-direction: column !important;
    }
    .b1_list img{
        width: 100% !important;
        height: auto !important;
    }
}