/* YouTube block */
.youtubeBlockResponsive16by9, .youtubeBlockResponsive4by3 {
    position: relative;
    height: 0;
}

.youtubeBlockResponsive16by9 iframe, .youtubeBlockResponsive4by3 iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.youtubeBlockResponsive16by9 {
    padding-bottom: 56.25%
}

.youtubeBlockResponsive4by3 {
    padding-bottom: 75%;
}