:root {
    --md-primary-fg-color:    #FDDD3D;
    --md-primary-bg-color:    #000000;
  }

  .video-wrapper {
    position: relative;
    display: block;
    height: 0;
    padding: 0;
    overflow: hidden;
    padding-bottom: 56.25%;
  }
  .video-wrapper > iframe {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
  }
  /* Maximum space for text block */
.md-grid {
  max-width: 98%; /* or 100%, if you want to stretch to full-width */
}