body {
  margin: 0;
  background: #111;
  color: #eee;
  font-family: Arial, sans-serif;
}

#chat-container {
  display: flex;
  height: 100vh;
}

#sidebar {
  width: 200px;
  background: #222;
  padding: 10px;
  overflow-y: auto;
}

#sidebar h3 {
  margin-top: 0;
}

#users {
  list-style: none;
  padding: 0;
}

#messages-container {
  flex: 1;
  display: flex;
  flex-direction: column;
}

#messages {
  list-style: none;
  padding: 10px;
  flex: 1;
  overflow-y: auto;
}

#messages li {
  padding: 5px 0;
}

#typing {
  padding: 5px 10px;
  font-style: italic;
  color: #aaa;
}

#form {
  display: flex;
  padding: 10px;
  background: #222;
}

#input {
  flex: 1;
  padding: 10px;
  border: none;
  background: #333;
  color: #eee;
}

button {
  padding: 10px 20px;
  background: #444;
  color: #eee;
  border: none;
  cursor: pointer;
}

#rooms {
  width: 100%;
  padding: 8px;
  margin-bottom: 10px;
  background: #333;
  color: #eee;
  border: 1px solid #444;
  border-radius: 4px;
  font-size: 14px;
}

#rooms option {
  background: #222;
  color: #eee;
}