.iframe-container {
    position: relative;
    display: block;
    width: 90%; /* width of iframe wrapper */
    height: 0;
    margin: auto;
    padding: 0% 0% 56.25%; /* 16:9 ratio */
    overflow: hidden;
}

.iframe-container iframe {
    position: absolute;
    top: 0; bottom: 0; left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

@media screen and (-webkit-min-device-pixel-ratio:0) {
    .scaled-frame {
        zoom: 1;
    }
}