--description--

Bootstrap has another button class called btn-default.

Apply both the btn and btn-default classes to each of your button elements.

--hints--

You should apply the btn class to each of your button elements.

assert.lengthOf(document.querySelectorAll('.btn'),6);

You should apply the btn-default class to each of your button elements.

assert.lengthOf(document.querySelectorAll('.btn-default'), 6);

--seed--

--seed-contents--

html

<div class="container-fluid">
  <h3 class="text-primary text-center">jQuery Playground</h3>
  <div class="row">
    <div class="col-xs-6">
      <div class="well">
        <button></button>
        <button></button>
        <button></button>
      </div>
    </div>
    <div class="col-xs-6">
      <div class="well">
        <button></button>
        <button></button>
        <button></button>
      </div>
    </div>
  </div>
</div>

--solutions--