JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
  <span>Peek-A-</span>
  <div class="child">
    <span>Boo</span>
  </div>
</div>

CSS

.child {
  display: none;
}

JavaScript

$(document).ready(function() {
  $(".parent").hover(function() {
    $(this).children(".child").fadeIn("fast");
  }, function() {
    $(this).children(".child").fadeOut("fast");
  });
});