/* CSSでレスポンシブ対応 */
@media screen and (max-width: 600px) {
  .iframe-wrapper {
    position: relative;
    width: 100%;
    padding: calc(980 / 780 * 100%) 0 0;
    margin: 20px 0px;
  }
  .iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100% !important;
  }
}