.video-container {

    width: 215px;
    height: 120px;
    margin: 0 auto 1em;
    position: relative;
    z-index: 1;
}

.video-container iframe{

    width: 100%;
    height: 100%;
    position: relative;
    z-index: 1;
}

@media only screen and (min-width: 481px) {
    .video-container {

        width: 175px;
        height: 100px;

        float: left;
        margin: 5px;
    }
}

@media only screen and (min-width: 768px) {
    .video-container {

        width: 198px;
        height: 122px;
    }
}

@media only screen and (min-width: 990px) {
    .video-container {

        width: 270px;
        height: 167px;
    }
}