Some css magic for creating responsive videos and iframes:
/* responsive styling for videos: */
video {
width: 100% !important;
height: auto !important;
}
/* responsive styling for iframes: */
.videoWrapper {
position: relative;
padding-bottom: 56.25%; /* 16:9 */
padding-top: 25px;
margin: 15px 0;
height: 0;
}
.videoWrapper iframe,
.videoWrapper object,
.videoWrapper embed {
position: absolute;
top: 0;
left: 0;
max-width: 100%;
height: 100%;
}