Styles for responsive iframe

style.css

.iframe-responsive-container {
    position: relative;
    padding-bottom: 56.25%;
    padding-top: 30px;
    height: 0;
}

.iframe-responsive-container iframe {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 100% !important;
}