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HTML

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CSS

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CSS Base

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JavaScript

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HTML 

              
                <input class="input" type="text" id="input" value="" autocomplete="off" placeholder="Type something...">
  <div id="container">
    <svg viewBox="0 0 90 90" xmlns="http://www.w3.org/2000/svg" id="template">
      <defs>
      <filter id="a">
        <feGaussianBlur stdDeviation="2.16856"/>
      </filter>
      </defs>
      <path transform="matrix(1.0906 0 0 1.0702 -5.1986 -3.458)" d="m33.031 8.6875c-7.0545 0.06801-14.169 3.1836-18.562 9.4062-9.3863 13.293-2.3038 31.359 6.125 31.75 4.8678 0.22555 15.124-3.9054 23.899 12.099 5.1049 9.3116 16.092 0.51875 20.164 0.21301 13.006-0.9766 17.062 19.719 17.062 19.719s-2.082-27.083-8.9688-34.719c-4.6157-5.1176-12.282-1.7067-16.031-8.375s-1.4206-13.606-3.9062-18.594c-3.8507-7.7268-11.786-11.577-19.781-11.5zm11.655 25.247c-3.395 1.3247-21.104-11.818-13.553-16.266s18.016 11.731 13.553 16.266zm-14.698 5.966c-3.395 6.0709-17.359-11.631-11.207-16.434s13.815 13.408 11.207 16.434zm22.7 7.3062c-6.3296 7.8794-19.036-7.6155-17.72-12.769 5.5711 0.65766 17.286 6.6861 17.72 12.769z" fill="#fff" filter="url(#a)" opacity=".6"/>
    </svg>
  </div>
!

CSS 

              
                * {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  overflow: hidden;
}

html, body {
  width: 100%;
  height: 100%;
}

body {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #000;
}

svg {
  position: absolute;
  width: 200px;
  animation: moveGhosts 4s linear;
  animation-direction: reverse;
};

#ghosts-container {
  position: relative;
}

#template {
  display: none;
}

input {
  position: absolute;
  display: block;
  padding: 12px 6px;
  border: none;
  border-radius: 5px;
  font-size: 30px;
  text-align: center;
  box-shadow: 0 0 30px 7px rgba(0, 0, 0, 0.2);
}

@keyframes moveGhosts {
  to {
    top: 100vh;
    opacity: 0.4;
  }
}
!

JS 

              
                let ww = window.innerWidth;
let wh = window.innerHeight;

let ghosts = document.getElementById("container");
let ghostTemplate = document.getElementById("template");
let input = document.getElementById("input");
input.addEventListener("input", run)
input.addEventListener("click", run)
input.addEventListener("focus", run)

function createGhosts() {
  let newGhost = ghostTemplate.cloneNode(true);
  newGhost.removeAttribute("id");
  let orientation = (Math.random() > 0.5) ? 1 : -1;
  newGhost.style.transform = `scale(${orientation}, 1) rotate(45deg)`;
  newGhost.style.left = getRandomNumber(0, ww) - 100 + "px";
  console.log(newGhost.style.left)
  newGhost.style.top = wh * (-(Math.random() + 0.5) * 2) + "px";
  newGhost.style.display = "block";
  ghosts.appendChild(newGhost)
}

function run() {
  for (let i = 0; i < 30; i += 1) {
    createGhosts();
    input.value = "Booooo!!";
  }
  input.removeEventListener("input", run);
  input.removeEventListener("click", run);
  input.removeEventListener("focus", run);
}

function getRandomNumber(min, max) {
  return Math.random() * (max - min) - min;
}
!
999px

Console