body {
  font-family: system-ui, sans-serif;
  background: #f8f8fa;
  margin: 0;
  padding: 0;
}
main {
  max-width: 600px;
  margin: 2em auto;
  background: #fff;
  border-radius: 8px;
  padding: 2em;
  box-shadow: 0 2px 8px #0001;
}
#video-thumbnail {
  width: 100%;
  max-width: 480px;
  border-radius: 8px;
  margin: 1em 0;
}
#player-container {
  width: 100%;
  max-width: 480px;
  margin: 1em 0;
}
video {
  width: 100%;
  border-radius: 8px;
  background: #000;
}
#custom-controls {
  display: flex;
  gap: 1em;
  margin-top: 0.5em;
}
@media (max-width: 600px) {
  main {
    padding: 1em;
  }
  #video-thumbnail, #player-container {
    max-width: 100%;
  }
}