Snigdha-OS.github.io/src/components/defaults/layout.js

import React, { useEffect } from 'react'
import GlobalStyle from '../../theme/globalStyle'
import styled from 'styled-components'
import Footer from '../footer'

const LayoutWrapper = styled.div`
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  main {
    flex-grow: 1;
  }
`
const Main = styled.main``

const Layout = ({ children }) => {
  if (typeof window !== 'undefined') require('smooth-scroll')('a[href*="#"]')

  useEffect(() => {
    window.addEventListener('scroll', () => {
      const isTop = window.scrollY > 200
      const nav = document.getElementById('nav')
      if (nav)
        isTop ? nav.classList.add('scrolled') : nav.classList.remove('scrolled')
    })
  }, [])

  return (
    <LayoutWrapper>
      <GlobalStyle />
      <Main>{children}</Main>
      <Footer />
    </LayoutWrapper>
  )
}

export default Layout