.movie {
    position: relative;
    width: 100%;
    height: 0px;
    padding-bottom: 56.25%;     /* 16:9 */
}

.movie .movie-inner {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
}

.movie .movie-inner iframe {
    width: 100%;
    height: 100%;
}

.wp-media-buttons .add-movie span.wp-media-buttons-icon:before {
    font: 400 18px/1 dashicons;
    speak: none;
    -webkit-font-smoothing: antialiased;
    content: "\f234";
}