.youtube_wrap {
  margin-top: 1em;
  margin-bottom: 1em;
}
.youtube_embed_container {
  text-align: center;
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
}
.youtube_embed_container iframe {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}