Check Radio Buttons & Checkboxes by Default

Tell us what’s happening:
I have tried doing this several ways and it is just not happening. The hints haven’t provided a good example.

Your code so far

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
  .red-text {
    color: red;
  }

  h2 {
    font-family: Lobster, Monospace;
  }

  p {
    font-size: 16px;
    font-family: Monospace;
  }

  .thick-green-border {
    border-color: green;
    border-width: 10px;
    border-style: solid;
    border-radius: 50%;
  }

  .smaller-image {
    width: 100px;
  }
</style>

<h2 class="red-text">CatPhotoApp</h2>

<p>Click here for <a href="#">cat photos</a>.</p>

<a href="#"><img class="smaller-image thick-green-border" alt="A cute orange cat lying on its back. " src="https://bit.ly/fcc-relaxing-cat"></a>

<p>Things cats love:</p>
<ul>
  <li>cat nip</li>
  <li>laser pointers</li>
  <li>lasagna</li>
</ul>
<p>Top 3 things cats hate:</p>
<ol>
  <li>flea treatment</li>
  <li>thunder</li>
  <li>other cats</li>
</ol>
<form action="/submit-cat-photo">
  <label><input type="radio" name="indoor-outdoor"> Indoor</label>
  <input type="radio" name="indoor-outdoor" Indoor checked>
  <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
  <label><input type="checkbox" name="personality"> Loving </label>
  <input type="checkbox" name="personality" Loving checked>
  <label><input type="checkbox" name="personality"> Lazy</label>
  <label><input type="checkbox" name="personality"> Energetic</label>
  <input type="text" placeholder="cat photo URL" required>
  <button type="submit">Submit</button>
</form>

Your browser information:

Your Browser User Agent is: Mozilla/5.0 (iPad; CPU OS 11_0_2 like Mac OS X) AppleWebKit/603.1.30 (KHTML, like Gecko) CriOS/61.0.3163.73 Mobile/15A421 Safari/602.1.

Link to the challenge:
https://www.freecodecamp.org/challenges/check-radio-buttons-and-checkboxes-by-default