body {
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  display: flex;
  justify-content: center;
  padding: 50px;
}
#chatbox {
  background: white;
  border-radius: 10px;
  padding: 20px;
  width: 100%;
  max-width: 500px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
#chatlog {
  height: 300px;
  overflow-y: auto;
  border: 1px solid #ddd;
  padding: 10px;
  margin-bottom: 10px;
  font-size: 14px;
}
input[type="text"] {
  width: 100%;
  padding: 10px;
  border: 1px solid #aaa;
  border-radius: 5px;
}