portfolio/src/pages/404.jsx

import React, { Component } from 'react'
import Link from 'gatsby'
import giphyAPI from 'giphy-js-sdk-core'
import Layout from '../components/Layout'
import Content from '../components/atoms/Content'
import './404.scss'

// Famous last words:
// "It's just the 404 page so why not expose the dev API key"
const giphyClient = giphyAPI('LfXRwufRyt6PK414G2kKJBv3L8NdnxyR')
const tag = 'fail-cat'

class NotFound extends Component {
  constructor(props) {
    super(props)
    this.state = { gif: '' }

    this.handleClick = this.handleClick.bind(this)
  }

  componentDidMount() {
    this.getRandomGif()
  }

  getRandomGif() {
    giphyClient
      .random('gifs', { tag })
      .then(response => {
        const gif = response.data.images.original.mp4
        this.setState({ gif })
      })
      .catch(err => {
        return err
      })
  }

  handleClick(e) {
    e.preventDefault()
    this.getRandomGif()
  }

  render() {
    return (
      <Layout>
        <Content className="content content--404">
          <h1>Shenanigans, page not found.</h1>
          <p>
            You might want to check the url, or{' '}
            <Link to={'/'}>go back to the homepage</Link>. Or just check out
            some fail gifs, entirely your choice.
          </p>

          <video className="gif" src={this.state.gif} autoPlay loop />

          <div>
            <a className="gif__action" href="#" onClick={this.handleClick}>
              Show me another cat fail gif
            </a>
          </div>
        </Content>
      </Layout>
    )
  }
}

export default NotFound