.video-js{
    margin: 0 auto;
}
@media only screen and (max-width: 800px) {
    .my-video2-div {
        width:100%;
        margin:0 auto;
        margin-bottom: 10px;
    }
}

@media only screen and (min-width: 800px) {
    .my-video2-div {
        width:90%;
        margin:0 auto;
        margin-bottom: 40px;
    }
}


@media only screen and (min-width: 1680px) {
    .via_history{
        font-size: 18px;
    }
    .via_history_span{
        color:#0c3189;
        font-size: 18px;
        font-weight: 800;
    }
    .via_history_span2{
        font-size: 16px;
    }
}
@media only screen and (min-width: 800px) and (max-width: 1680px) {
    .via_history{
        font-size: 0.18rem;
    }
    .via_history_span{
        color:#0c3189;
        font-size: 0.18rem;
        font-weight: 800;
    }
    .via_history_span2{
        font-size: 0.16rem;
    }
}
@media only screen and (max-width: 800px) {
    .via_history{
        font-size: 16px;
    }
    .via_history_span{
        color:#0c3189;
        font-size: 16px;
        font-weight: 800;
    }
    .via_history_span2{
        font-size: 14px;
    }
}