Fixed tailwindcss classes (#629)

frontend/src/main.tsx

@@ -1,3 +1,4 @@
+import { initThemeMode } from "flowbite-react";
 import { StrictMode } from "react";
 import { createRoot } from "react-dom/client";
 import { ThemeInit } from "../.flowbite-react/init";
@@ -10,3 +11,5 @@ createRoot(document.getElementById("root") as HTMLElement).render(
     <App />
   </StrictMode>
 );
+
+initThemeMode();