Javascript click button to copy textarea or input

How to do a button click to copy for a text box or input with HTML and a little bit of Javascript.

The HTML (bootstrap):

<div class="container">
  <div class="row mt-2">
    <div class="col-6">
      <button id="words" class="btn btn-primary mb-2">Copy text area</button>
      <br />
      <textarea id="text_copy" class="form-control" name="text_copy" rows="5" cols="12" readonly>
Word
Word2
Word3
Word4</textarea>
      <br />
    </div>
    <div class="col-6">
      <button id="input-btn" class="btn btn-primary mb-2">Copy input</button>
      <br />
      <input type="text" class="form-control" id="input" name="input" value="test text to copy">
    </div>
  </div>
</div>

The Javascript functions to copy the text:

document.querySelector("#words").onclick = function () {
  document.querySelector("#text_copy").select();
  document.execCommand("copy");
};

document.querySelector("#input-btn").onclick = function () {
  document.querySelector("#input").select();
  document.execCommand("copy");
};

CodePen link.