.embed-container {
    display:block;
    height:0;
    margin:0 auto 2rem;
    max-width: 100%;
    position: relative;
    padding-bottom: 56.25%;
    overflow: hidden;
    height:auto;
}
.embed-container iframe,
.embed-container object,
.embed-container embed {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}