<div id="stage">
<span class="emoji">⭐</span>
<span class="emoji">⭐</span>
<span class="emoji">⭐</span>
<span class="emoji">⭐</span>
<span class="emoji">⭐</span>
</div>
.emoji {
font-size: 40px;
cursor: pointer;
transition: font-size 0.2s;
}
.shining {
font-size: 70px;
}
const stage = document.querySelector('#stage');
stage.addEventListener('click', function(event) {
event.target.classList.toggle('shining');
});