body {
  font-family: Arial, sans-serif;
  background: #fafafa;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
}

#app {
  max-width: 500px;
  width: 100%;
  margin-top: 40px;
}

#chatbox {
  background: white;
  padding: 20px;
  border-radius: 10px;
  height: 450px;
  overflow-y: auto;
  box-shadow: 0 2px 20px rgba(0,0,0,0.1);
}

.input {
  display: flex;
  margin-top: 15px;
}

input {
  flex: 1;
  padding: 10px;
}

button {
  padding: 10px 20px;
  background: black;
  color: white;
  border: none;
  cursor: pointer;
}