* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  body {
    font-family: sans-serif;
    background-color: #f1f1f1;
  }
  
  .chat-container {
    max-width: 600px;
    margin: 50px auto;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
    overflow: hidden;
  }
  
  .chat-header {
    background-color: #4caf50;
    color: #fff;
    padding: 20px;
  }
  
  .chat-history {
    height: calc(100vh - 400px);
    overflow-y: scroll;
    padding: 10px;
  }
  
  .message-container {
    display: flex;
    justify-content: flex-start;
    margin-bottom: 10px;
  }
  
  .message-bubble {
    max-width: 80%;
    margin-left: 5px;
    padding: 10px;
    border-radius: 5px;
    font-size: 16px;
    line-height: 1.4;
    word-wrap: break-word;
  }
  
  .message-bubble.user {
    background-color: #e1ffc7;
    align-self: flex-start;
  }
  
  .message-bubble.assistant {
    background-color: #fff;
    align-self: flex-end;
  }
  
  .message-bubble.user + .message-bubble.assistant {
    margin-top: 10px;
  }

  #message {
    width: 80%;
  }

  #message-form {
    width: 100%;
  }
  
  .chat-input {
    display: flex;
    align-items: center;
    background-color: #fff;
    padding: 20px;
  }
  
  .chat-input input[type="text"] {
    flex-grow: 1;
    padding: 10px;
    border-radius: 5px;
    border: none;
    outline: none;
  }
  
  .chat-input button {
    flex-shrink: 0;
    margin-left: 10px;
    background-color: #4caf50;
    color: #fff;
    padding: 10px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
  }

  .spinner {
    font-size: 40px;
    text-align: center;
    display: none;
    padding: 20px;
  }
  
  @media only screen and (max-width: 768px) {
    .chat-container {
      margin: 20px;
    }
  
    .chat-history {
      height: calc(100vh - 500px);
    }
  }