body {
  font-family: Arial, sans-serif;
  text-align: center;
  padding: 20px;
}

#lobby {
  margin-top: 30px;
}

ul {
  list-style: none;
  padding: 0;
}

li {
  margin: 5px 0;
}

#player-name {
  padding: 5px;
}

#join-btn {
  padding: 5px 10px;
  margin-left: 10px;
}

#message {
  margin-top: 20px;
  font-weight: bold;
  color: green;
}