So i wondering how to nest code in to code?

Tell us what’s happening:
Describe your issue in detail here.

  **Your code so far**

<link href="https://fonts.googleapis.com/css?family=Lobster" rel="stylesheet" type="text/css">
<style>
h2 {
  font-family: Lobster, Monospace;
}

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

<div class="container-fluid">
<div class="row">
  <div class="col-xs-8">
    <h2 class="text-primary text-center">CatPhotoApp</h2>
  </div>
  <div class="col-xs-4">
    <a href="#"><img class="img-responsive thick-green-border" src="https://cdn.freecodecamp.org/curriculum/cat-photo-app/relaxing-cat.jpg" alt="A cute orange cat lying on its back."></a>
  </div>
</div>
<img src="https://cdn.freecodecamp.org/curriculum/cat-photo-app/running-cats.jpg" class="img-responsive" alt="Three kittens running towards the camera.">
<div class="row">
  <div class="col-xs-4">
    <button class="btn btn-block btn-primary"><i class="fa fa-thumbs-up"></i> Like</button>
  </div>
  <div class="col-xs-4">
    <button class="btn btn-block btn-info"><i class="fa fa-info-circle"></i> Info</button>
  </div>
  <div class="col-xs-4">
    <button class="btn btn-block btn-danger"><i class="fa fa-trash"></i> Delete</button>
  </div>
</div>
<p>Things cats <span class="text-danger">love:</span></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="https://freecatphotoapp.com/submit-cat-photo">
  <label><input type="radio" name="indoor-outdoor"> Indoor</label>
  <label><input type="radio" name="indoor-outdoor"> Outdoor</label>
  <label><input type="checkbox" name="personality"> Loving</label>
  <label><input type="checkbox" name="personality"> Lazy</label>
  <label><input type="checkbox" name="personality"> Crazy</label>
  <input type="text" placeholder="cat photo URL" required>
  <button type="submit">Submit</button>
</form>
</div>
  **Your browser information:**

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.1 Safari/605.1.15

Challenge: Responsively Style Radio Buttons

Link to the challenge:

Because it’s confusing me
I try something and it says you have to nest bla bla blab blab
And it’s weird

Have you started the FCC courses from the beginning? Nesting is introduced early on in Basic HTML and HTML5

As a reminder, here is an example of nesting

<parentElement attributeName="value">
  <nestedElement attributeName="value"> </nestedElement>
</parentElement>

Hope that helps

Tysm you just helped me a lot ty ty ty