A bit of style for the youtube iframe

youtube.scss

  .youtube-wrapper {
      position: relative;
      padding-bottom: 52%; /* 16:9 */
      padding-top: 25px;
      height: 0;
      iframe {
          position: absolute;
          top: 0;
          left: 0;
          width: 100%;
          height: 100%;
      }
  }