Survey Form - Problems with descendant of #survey-form

I don’t know what I should do. Can someone help me out?
The code is fine except that I should make my inputs, textarea, radio-buttons and so on to be descendant of #survey-form. How do I do that?

Your code so far

<!-- file: index.html -->
<DOCTYPE! html>
<html>
  <head>
    <link rel="stylesheet" href="styles.css">
  </head>
  <body>
    <h1 id="title">Sports Survey Form</h1>
    <p id="description">Thank you for taking the time to answer all the questions</p>
    <div>
    <form id="survey-form">
      <label id="name-label">
        <p>Name</p>
        <input id="name" type="text" placeholder="Enter your name" class="box" required></input>
      </label>
      <label id="email-label">
        <p>Email</p>
        <input id="email" type="email" placeholder="Enter your Email" class="box" required></input>
      </label>
      <p>Age (optional)</p>
      <label id="number-label" >
        <input id="number" type="number" min="8" max="90" placeholder="Age" class="box"></input>
      </label>
      </div>
      <p>How often do you train per week?</p>
      <select id="dropdown" class="box">
        <option value="" disabled selected hidden>Select current capacity</option>
        <option>1-2 times</option>
        <option>3-5 times</option>
        <option>6-7 times</option>
        <option>more than 7 times</option>
        <option>I don't train currently</option>
      </select>
      <p>Would you like to train more than you currently are?</p>
      <input name="certanity" type="radio" value="yes"> Yes, for sure! <br>
      <input name="certanity" type="radio" value="no"> No, thanks! <br>
      <input name="certanity" type="radio" value="not-sure"> Not sure
      <p>Do you enjoy exercising?</p>
      <select id="dropdown" class="box">
        <option value="" disabled selected hidden>Select an option</option>
        <option>Yes</option>
        <option>No</option>
        <option>I don't mind</option>
      </select>
      <p>Why do you exercise?</p>
      <input type="checkbox" value="healthier"> To be healthier <br>
      <input type="checkbox" value="fitter"> To be fitter <br>
      <input type="checkbox" value="look"> To look better
      <p>Any additional comments?</p>
      <textarea placeholder="Enter your comment here..." cols="20" rows="4"></textarea>
      <p></p>
      <input type="submit" value="Click to submit" id="submit" class="submit">
    </form>
  </body>
</html>
/* file: styles.css */
body {
  font-family: arial, sans-serif;
  text-align: center;
  background-color: rgba(50, 0, 899, 0.2);
  color: rgba(100, 0, 200, 1);
  border-style: solid;
  margin: 10% 5%;
}

.box {
  width: 55%;
  margin: auto;
  text-align: center;
}

.submit {
  width: 55%;
  margin: auto;
  height: 50px;
  background-color: rgba(0, 150, 256, 0.7);
}

h1 {
  font-weight: bold;
  font-variant: small-caps;
}

Your browser information:

User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.1 Safari/605.1.15

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