body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: #f4f4f4;
}

.chat-container {
  width: 100%;
  max-width: 600px;
  margin: 50px auto;
  background: white;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  border-radius: 8px;
  overflow: hidden;
}

.chat-header {
  background: #4CAF50;
  color: white;
  padding: 15px;
  font-size: 18px;
}

.chat-box {
  height: 400px;
  overflow-y: scroll;
  padding: 10px;
  border-bottom: 1px solid #ccc;
}

.chat-message {
  margin-bottom: 10px;
}

.chat-input {
  display: flex;
  padding: 10px;
}

.chat-input input {
  flex: 1;
  padding: 10px;
  font-size: 16px;
}

.chat-input button {
  padding: 10px 15px;
  background: #4CAF50;
  color: white;
  border: none;
  cursor: pointer;
}