*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: #111;
  color: #eee;
  font-family: system-ui, sans-serif;
}

.container {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 16px;
}

.video {
  width: min(100%, 1536px);
  aspect-ratio: 16 / 9;
}

.video iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}