* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  width: 100%;
  background-color: #111;
  font-family: sans-serif;
  color: #f0f0f0;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

video {
  width: 1000px;
  height: 600px;
  object-fit: contain;
  background: black;
}