A beautiful 404 page should have some dynamic effects. These kind of effects attract the users’ attentions more and hopefully make them your site fan. The matrix effect, which reminds us the movie with this name, can play an important role for this purpose. Please see the demo!


HTML
<!-- This script got from www.devanswer.com  -->
<canvas></canvas>
<div class="content">
<h1>404</h1>
</div>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css">
<script src='https://cdnjs.cloudflare.com/ajax/libs/pixi.js/4.7.1/pixi.min.js'></script><div id="bcl"><a style="font-size:8pt;text-decoration:none;" href="http://www.devanswer.com ">Developers Answer</a></div>
                        

CSS
@import url("https://fonts.googleapis.com/css?family=Roboto");
* {
  box-sizing: border-box;
}
body {
  font-family: 'Roboto', sans-serif;
  min-height: 100vh;
  background: linear-gradient(35deg, #a1eeeb 30%, #4331ec 85%);
  background: linear-gradient(35deg, #f8d60f 20%, #fc5c5c 85%);
  background: linear-gradient(65deg, #fbdc14 20%, #04c4d4 20%, #04c4d4 65%, #fc5c5c 65%, #fc5c5c 85%);
}
canvas {
  height: 30vh;
  left: 0;
  position: absolute;
  top: 0;
  width: 100vw;
}
canvas {
  top: 50%;
  -webkit-transform: translate(0, -50%);
          transform: translate(0, -50%);
}
.content {
  align-items: center;
  color: #fafafa;
  display: flex;
  height: 100vh;
  width: 100vw;
  position: absolute;
  justify-content: center;
  z-index: 2;
}
.content h1 {
  font-size: 4rem;
  text-shadow: 10px 10px 5px rgba(0,0,0,0.5);
}
@media (min-width: 768px) {
  .content h1 {
    font-size: 10rem;
  }
}
Javascript
const {
  PIXI: {
    Application,
    particles: { ParticleContainer },
    Sprite } } =

window;
let FONT_SIZE = innerHeight / 10;
const FRACTION = 0.3;
const PARTICLE_CONTAINER_OPTS = {
  scale: true,
  position: true,
  alpha: true };

const getHeight = () => Math.floor(innerHeight * FRACTION);
const view = document.querySelector('canvas');
const AMOUNT = 100;
const onTick = () => {
  if (
  App.renderer.width !== innerWidth ||
  App.renderer.height !== getHeight())
  {
    App.renderer.resize(innerWidth, getHeight());
    Fours.removeChildren();
    Ohhhs.removeChildren();
    Page.removeChildren();
    FONT_SIZE = innerHeight / 10;
    bootstrapLayers();
  }
  for (const p of [...Fours.children, ...Ohhhs.children, ...Page.children]) {
    p.x -= p.vx;
    if (p.x < -p.width) {
      p.x = p.startingX;
    }
  }
};

const App = new Application({
  antialias: true,
  height: getHeight(),
  transparent: true,
  view,
  width: innerWidth });


const createText = (text, opts = { height: FONT_SIZE * 2, width: FONT_SIZE * 2 }) => {
  const canvas = document.createElement('canvas');
  canvas.width = opts.width;
  canvas.height = opts.height;
  const context = canvas.getContext('2d');
  context.font = `${Math.floor(innerHeight / 10)}px Roboto`;
  context.fillStyle = '#ffffff';
  context.fillText(text, 0, FONT_SIZE, innerWidth);
  return canvas;
};

const addParticles = (amount, container, text) => {
  new Array(amount).fill().map(p => {
    p = new Sprite.from(text);
    p.vx = Math.random() * 10 + 1;
    p.x = p.startingX = innerWidth + (Math.floor(Math.random() * (innerWidth * 2 - text.width * 2)) + text.width * 2);
    p.y = Math.floor(Math.random() * (getHeight() - text.height / 2));
    p.scale.x = p.scale.y = (Math.random() * 50 + 50) / 100;
    p.alpha = Math.random() * 50 / 100;
    container.addChild(p);
  });
};

const bootstrapLayers = () => {
  addParticles(Math.floor(innerWidth / 10), Fours, createText('4'));
  addParticles(Math.floor(innerWidth / 10), Ohhhs, createText('0'));
  addParticles(Math.floor(innerWidth / 50), Page, createText('Page not found', { height: FONT_SIZE * 2, width: innerWidth }));
};

const Fours = new ParticleContainer(Math.floor(innerWidth / 10), PARTICLE_CONTAINER_OPTS);
const Ohhhs = new ParticleContainer(Math.floor(innerWidth / 10), PARTICLE_CONTAINER_OPTS);
const Page = new ParticleContainer(Math.floor(innerWidth / 50), PARTICLE_CONTAINER_OPTS);
bootstrapLayers();

App.stage.addChild(Fours);
App.stage.addChild(Ohhhs);
App.stage.addChild(Page);
App.ticker.add(onTick);