@media only screen and (max-width: 1140px) {
    .my-video2-div {
        width:100%;
        margin:0 auto;
        margin-bottom: 10px;
    }
}

@media only screen and (min-width: 1140px) {
    .my-video2-div {
        width:90%;
        margin:0 auto;
        margin-bottom: 40px;
    }
}