body {
  font-family: Arial, sans-serif;
  background: #181818;
  color: #fff;
  text-align: center;
}
#channel-list {
  margin: 20px 0;
}
.channel-btn {
  background: #222;
  color: #fff;
  border: none;
  padding: 10px 20px;
  margin: 5px;
  cursor: pointer;
  border-radius: 5px;
  transition: background 0.2s;
}
.channel-btn:hover {
  background: #444;
}
video {
  margin-top: 20px;
  background: #000;
  border-radius: 10px;
}