.video_wrap {
  max-width: 600px;
  padding: 0;
  box-sizing: border-box;
  text-align:center;
}

  .video_wrap .inner {
    padding-top: 56.25%;
    position: relative;
    height: 0;
    overflow: hidden;
  }

  .video_wrap .inner iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
  }
  .video_wrap .inner video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
  }