.responsive-container {
  position: relative;
  width: 100%;
  max-width: 100%;
  height: 0;
  padding-bottom: 62.5%;
  border: 1px solid #cacaca;
  overflow: hidden;
}

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