html {
  color-scheme: dark;
  font-family: system-ui, sans-serif;
}

body {
  display: grid;
  min-height: 100vh;
  margin: 0;
  padding: 1rem;
  place-items: center;
  background: #000;
  box-sizing: border-box;
}

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

.player {
  width: min(100%, 960px);
  aspect-ratio: 16 / 9;
}

.player iframe {
  width: 100%;
  height: 100%;
  border: 0;
}