npm install lenis

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// src/components/SmoothScroll.tsx
'use client'

import { ReactNode, useEffect } from 'react'
import Lenis from 'lenis'

export default function SmoothScroll({ children }: { children: ReactNode }) {
  useEffect(() => {
    const lenis = new Lenis({
      duration: 1.2,
      easing: (t) => Math.min(1, 1.001 - Math.pow(2, -10 * t)),
      orientation: 'vertical',
      gestureOrientation: 'vertical',
      smoothWheel: true,
    })

    function raf(time: number) {
      lenis.raf(time)
      requestAnimationFrame(raf)
    }

    requestAnimationFrame(raf)

    return () => {
      lenis.destroy()
    }
  }, [])

  return <>{children}</>
}

import SmoothScroll from '@/components/SmoothScroll'

export default function RootLayout({ children }) {
  return (
    <html lang="en">
      <body>
        <SmoothScroll>
          {children}
        </SmoothScroll>
      </body>
    </html>
  )
}