お前だけ変われ

.emoji {
  font-size: 400px;
  cursor: pointer;
  transition: font-size 0.2s;
}

.shining {
  font-size: 10px;
color:gold:
}

const stage = document.querySelector('#stage');

stage.addEventListener('click', function(event) {
  event.target.classList.toggle('shining');
});