node_modules/video.js/src/css/components/_live.scss

// We are assuming there is no progress bar and using the live display
// to fill in the middle space. Live+DVR will need to adjust this.
.video-js .vjs-live-control {
  @include display-flex(flex-start);
  @include flex(auto);
  font-size: 1em;
  line-height: 3em;
}
.vjs-no-flex .vjs-live-control {
  display: table-cell;
  width: auto;
  text-align: left;
}