.promotion .banner img{
    max-width: 1440px;
    width: 100%;
}

.promotion .content{
    max-width: 900px;
    width: 90%;
    margin: auto;
    /*padding: 50px 0;*/
}

.promotion .content .title{
    font-size: 28px;
    line-height: 34px;
}

.promotion .content .cation{
    font-size: 14px;
    line-height: 21px;
}

.promotion .banner{
    width: 90%;
    margin: auto;
}