consul/website/pages/404.jsx

import Link from 'next/link'
import { useEffect } from 'react'

export default function NotFound() {
  useEffect(() => {
    if (
      typeof window !== 'undefined' &&
      typeof window?.analytics?.track === 'function' &&
      typeof window?.document?.referrer === 'string' &&
      typeof window?.location?.href === 'string'
    )
      window.analytics.track(window.location.href, {
        category: '404 Response',
        label: window.document.referrer || 'No Referrer',
      })
  }, [])

  return (
    <div id="p-404">
      <h1 className="g-type-display-1">Page Not Found</h1>
      <p>
        We&lsquo;re sorry but we can&lsquo;t find the page you&lsquo;re looking
        for.
      </p>
      <p>
        <Link href="/">
          <a>Back to Home</a>
        </Link>
      </p>
    </div>
  )
}