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Lab 4-2: Buttons to change the styling of a <div>

https://github.com/UChicagoWebDev/lab-4

<div id="testing_ground">Watch me change colors!</div>
<input type="button" onclick="recolor('testing_ground')" value="Colorize!"></input>
<script>
function recolor(id) {
  var e = document.body.querySelector("#"+id);
  e.setAttribute("style","color: red");
}
</script>