#chat-box { font-family: Tahoma, Arial; font-size: 14px; }
#chat-history::-webkit-scrollbar { width: 6px; }
#chat-history::-webkit-scrollbar-track { background: #f1f1f1; border-radius: 10px; }
#chat-history::-webkit-scrollbar-thumb { background: #ccc; border-radius: 10px; }
#chat-message { transition: height 0.2s; }