body {
  font-family: Arial, sans-serif;
  background-color: #333;
  color: #fff;
}

h1 {
  font-size: 2.5em;
  text-align: center;
  margin-top: 20px;
  color: #fff;
}

#chat-history {
  background-color: #444;
  border: 2px solid #666;
  border-radius: 5px;
  padding: 10px;
  margin: 20px auto;
  max-width: 600px;
  min-height: 300px;
  overflow-y: auto;
  max-height: 300px;
}

#message-form {
  display: flex;
  justify-content: center;
  align-items: center;
  margin-top: 20px;
}

#user-message {
  flex: 1;
  padding: 10px;
  font-size: 1.2em;
  border-radius: 5px;
  border: none;
  margin-right: 10px;
  background-color: #555;
  color: #fff;
}

button[type="submit"] {
  padding: 10px;
  font-size: 1.2em;
  background-color: #007bff;
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button[type="submit"]:hover {
  background-color: #0056b3;
}