body {
  font-family: Arial, sans-serif;
  background: #f0f2f5;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.chat-container {
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  width: 400px;
  max-height: 600px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-box {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
}

.input-area {
  display: flex;
  border-top: 1px solid #ccc;
}

#user-input {
  flex: 1;
  padding: 12px;
  border: none;
  font-size: 16px;
}

button {
  padding: 12px;
  border: none;
  background-color: #007bff;
  color: white;
  font-weight: bold;
  cursor: pointer;
}