JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
  <li>
    <label>
      <input type="checkbox">1
    </label>
  </li>
  <li>
    <label>
      <input type="checkbox">2
    </label>
  </li>
  <li>
    <label>
      <input type="checkbox">3
    </label>
  </li>
</ul>

CSS

ul li {
  background: #3CF;
  padding: 0.25em 0.5em;
  margin: 0.25em 0;
  display: block;
  cursor: pointer;
  text-indent: 1.5em;
}
ul li.active {
  background: #6EF;
}
label {
  display: block;
  width: 100px;
  border: 1px solid black;
}

JavaScript

var checks = document.querySelectorAll("ul li");

for (var i = 0; i < checks.length; i++) {
  checks[i].addEventListener("click", tog);
};

function tog(e) {
    alert(e.currentTarget);
  e.currentTarget.classList.toggle("active");
}