Updated to Drupal 8.5. Core Media not yet in use.

[yaffs-website] / web / modules / contrib / video_embed_field / modules / video_embed_wysiwyg / plugin / plugin.css

.video-embed-widget {
  text-align: center;
  display: block;
  padding-top: 15px;
}

.video-embed-widget:before {
  content: '\25b6';
  font-size: 120px;
  color: #fff;
  opacity: 0.9;
  position: absolute;
  z-index: 5;
  left: 0;
  right: 0;
  top: 50%;
  margin-top: -71px;
  text-shadow: 0px 0px 40px #000;
}

.video-embed-widget__summary {
  font-style: italic;
  display: block;
  padding: 15px;
  font-size: 13px;
}