.embed-responsive {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    max-width: 100%;
}
.embed-responsive-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}
.podcast-player {
    width: 100%;
    height: 150px;
    margin: 1em 0;
}