body {
  font-family: sans-serif;
  background: #f2f2f2;
  margin: 0;
  padding: 0;
  text-align: center;
}
.container {
  max-width: 500px;
  margin: 20px auto;
  background: white;
  padding: 20px;
  border-radius: 10px;
}
.controls {
  margin-bottom: 10px;
}
#chat-box {
  text-align: right;
}
#messages {
  border: 1px solid #ccc;
  padding: 10px;
  height: 200px;
  overflow-y: scroll;
  background: #f9f9f9;
}
textarea {
  width: 100%;
  height: 60px;
  margin-top: 10px;
}
button {
  margin-top: 5px;
  padding: 8px 12px;
}