.video-wrap {
  max-width: 800px;      /* max player width */
  width: 100%;           /* responsive */
  background: #000;      /* black bars */
  margin: 2rem auto;     /* center on page */
  text-align: center;    /* center inline video */
}

video {
  width: auto;
  max-width: 100%;       /* scale down horizontally */
  height: auto;
  max-height: 450px;     /* limit height for vertical videos */
  display: inline-block; /* lets text-align center work */
}