.iframe-container{
    display: block;
    position: relative; 
    overflow: hidden;
    width: 59.9%; 
    padding-top: 33.7%;
    margin: 30px auto 0;
}

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