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                <div class="bomb">💣</div>
<button id="button">désamorcer</button>



button {
  position: absolute;
  bottom: 2em;
  right: 2em;
  font-size: 2em;

.ouf .bomb {
 transform: scale(.15) rotate(567deg);
 animation: none

/* voir la version précédente :*/

html, body{
  height: 100%;
  margin: 0;
  overflow: hidden;
  /* centrage avec grid */
  display: grid;
  place-content: center;
  gap: 1ch;
  transition: all 250ms 250ms;
.bomb {
  /* size*/
  font-size: calc(1rem + 8vw);
  transition: all 250ms;
  /* animation */
  animation: brrr 10ms alternate infinite
@keyframes brrr {
  100% { transform: translateX(5px) }
.boom {
  background: black
.boom .bomb {
 transform: scale(15);
button {
  background: white;
  border: 3px solid;


                // initialisation du nombre d’essais
let essais = 0;

var button = document.querySelector("#button");

// au survol
button.onmouseover = () => {
  // si moins de 10 essais
  if(essais < 10 ){
    // getBoundingClientRect permet de lire la taille de l’élément
    let btn_size = button.getBoundingClientRect();
    // affecte une position aléatoire au bouton…
    // …contrainte par la dimension de l’écran MOINS la dimension de l’élément = Math.random() * (window.innerHeight - btn_size.height) + 'px'; = Math.random() * (window.innerWidth - btn_size.width) + 'px';
    // augmente la valeur du nombre d’essais
    essais += 1;
    // changement du texte du bouton
    button.textContent = "essaye encore 😈"
  } else {
    // si le nombre d’essais est supérieur ou égal à 10
    button.textContent = "une dernière fois ?"

button.onclick = () => {
  document.body.className = "ouf";
  button.textContent = "ouf…"