@media only screen and (max-width: 1200px) {
    .my-video2-div {
        max-width:100%;
        margin-top: 0.15rem;
    }
}

@media only screen and (min-width: 1200px) {
    .my-video2-div {
        max-width:100%;
        margin-top: 15px;
    }
}

.my-video2-div > video{
    max-width:100%;
}


@media only screen and (min-width: 1200px) {
    .partstip{
        margin-bottom: 40px;
        font-size: 18px;
    }
    .partstip2{
        margin-top: 40px;
        font-size: 18px;
    }
}

@media only screen and (max-width: 1200px) {
    .partstip{
        margin-bottom: 0.4rem;
        font-size: 0.24rem;
    }
    .partstip2{
        margin-top: 0.4rem;
        font-size: 0.24rem;
    }
}