.conatiner-iframe-lg {
  position: relative;
  overflow: hidden;
  padding-top: 60.25%;
  height: 100%;
}

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