.video_container{
  height: 0;
  padding-bottom: 56.25%;
  position: relative;
  width: 100%;
}

.video_container iframe{
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.video_container.mr-auto{
  margin-right: auto !important;
}

.video_container.ml-auto{
  margin-left: auto !important;
}

.video_container.mx-auto{
  margin-left: auto !important;
  margin-right: auto !important;
}