body {
  font-family: Arial;
  background: #2c2f33;
  color: white;
  margin: 0;
  padding: 0;
}

#login, #chat {
  max-width: 700px;
  margin: 30px auto;
  background: #23272a;
  padding: 20px;
  border-radius: 10px;
}

input, button {
  width: 100%;
  padding: 10px;
  margin-top: 10px;
  font-size: 16px;
}

#container {
  display: flex;
}

#messages {
  flex: 3;
  height: 300px;
  overflow-y: auto;
  background: #2c2f33;
  border: 1px solid #444;
  margin: 10px 10px 10px 0;
  padding: 10px;
}

#sidebar {
  flex: 1;
  background: #202225;
  border: 1px solid #444;
  padding: 10px;
  height: 300px;
  overflow-y: auto;
}

#sidebar h4 {
  margin-top: 0;
}

#user-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

#user-list li {
  margin-bottom: 5px;
}