website-2/pages/_app.tsx

import '../styles/globals.css'
import type { AppProps } from 'next/app'
import {ThemeProvider} from 'next-themes'

function MyApp({ Component, pageProps }: AppProps) {
  return (
    <>
      <ThemeProvider attribute="class">
        <Component {...pageProps} />
      </ThemeProvider>
    </>
  )
}

export default MyApp