JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" name="mycheckboxes">
<input type="checkbox" name="mycheckboxes">
<input type="checkbox" name="mycheckboxes">
<input type="checkbox" name="mycheckboxes">

<div id="showme" style="display: none">Show me</div>

JavaScript

$("input[name='mycheckboxes']").change(function() {
  $("#showme").toggle($("input[name='mycheckboxes']:checked").length>0);
});