.pages{
    display: flex;
    align-items: center;
    flex-direction: column;
    margin: 0;
}

.activity-line{
    display: flex;
    align-items: center;
    margin-top: 5.2vw;
}
.imgBack{
    background-size: 20vw auto;
    background-repeat: no-repeat;
    width: 20vw; 
    height: 50.04vw;
    display: flex;
    flex-direction: column;
    background-position: center;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease-out; /*ease-out 减速、慢慢结束*/
}
.activity-title{
    height: 2vw;
    font-size: 2vw;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: bold;
    color: #FFFFFF;
    line-height: 2vw;
    letter-spacing: 0.3125vw;
    margin-bottom: 1.5625vw;
}
.subTitle{
    height: 0.9375vw;
    font-size: 0.9375vw;
    font-family: PingFangSC-Medium, PingFang SC;
    font-weight: normal;
    color: #FFFFFF;
    line-height: 0.9375vw;
    letter-spacing: 3px;
}