.content-container {
    height: 350px;
}

.iframe-container {
    overflow: hidden;
    padding-top: 100%;
    position: relative;
    width: 100%;
}

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