body { padding: 20px; }
#chat-box { 
  height: 400px; 
  overflow-y: auto; 
  border: 1px solid #ccc; 
  padding: 10px; 
}
.user-msg { font-weight: bold; }
.agent-msg { margin-left: 10px; }
.tool-msg { color: darkblue; margin-left: 20px; font-style: italic; }