body {
    font-family: Arial, sans-serif;
      margin: 0;
      padding: 0;
      display: flex;
      flex-direction: column;
      height: 100vh;
      background-color: #f0f2f5;
}

#chat-container {
     flex: 1;
     max-width: 600px;
     width: 100%;
      margin: 20px auto;
      background: white;
      border-radius: 8px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    #messages {
      flex: 1;
      padding: 20px;
      overflow-y: auto;
      border-bottom: 1px solid #ddd;
    }

    .message {
      margin: 10px 0;
      padding: 10px 15px;
      border-radius: 15px;
      max-width: 70%;
      display: flex;
      flex-direction: column;
    }

    .sent {
      background-color: #0084ff;
      color: white;
      margin-left: auto;
    }

    .received {
      background-color: #e9ecef;
      color: black;
      margin-right: auto;
    }

    .sender {
      font-size: 0.9em;
      font-weight: bold;
      margin-bottom: 5px;
    }

    .timestamp {
      font-size: 0.8em;
      opacity: 0.7;
      margin-top: 5px;
      align-self: flex-end;
    }

    #input-container {
      display: flex;
      padding: 10px;
      background: #fff;
    }

    #message-input {
      flex: 1;
      padding: 10px;
      border: 1px solid #ddd;
      border-radius: 20px;
      outline: none;
      font-size: 16px;
    }

    #send-button {
      padding: 10px 20px;
      margin-left: 10px;
      background-color: #0084ff;
      color: white;
      border: none;
      border-radius: 20px;
      cursor: pointer;
    }

    #send-button:hover {
      background-color: #0066cc;
    }