.introduction{
    width: 100%;
    height: 780px;
    padding-top: 122px;
    background: url("/static/images/index/jianjie-bg.png") center top no-repeat;
}
.introduction_div{
    position: relative;
    width: 1200px;
    height: 560px;
    margin: 0px auto ;
    background: url("/static/images/index/bg.png") center top no-repeat;
}
.logo{
    position: absolute;
    top: 54px;
    left: 70px;
    width: 220px;
    height: 60px;
}
.bot{
    position: absolute;
    bottom: 50px;
    right: 94px;
    width: 38px;
    height: 41px;
}
.introduction_div_p{
    position: absolute;
    top: 112px;
    left: 374px;
    width: 721px;
    font-size:18px;
    font-weight:400;
    color:rgba(255,255,255,1);
    line-height:30px;
}
.introduction_div_p span{
    display: block;
    text-indent: 2rem;
}