Em to rem - unable to work out the answer for this question. Any advice?

Question

style.css

/* Complete the challenge by writing CSS below */

html {
  font-size: 16px;
}

header {
  font-size: 1.5em;
}

.heading {
  font-size: 5em;
}

index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Developer Diane: Resume</title>
  <link rel="stylesheet" href="page.css">
  <link rel="stylesheet" href="style.css">
</head>
<body>
  <main>
    <header>
      <div id="header-box">
        <h1 class="heading">Developer Diane: Resume</h1>
        <address>
          <p>website: developerdiane.com</p>
          <p>email: diane@developerdiane.com</p>
        </address>
        <img src="developer-diane.jpg" alt="Developer Diane coding on her laptop.">
      </div>
    </header>          
    <section id="education">
      <h2>Education</h2>          
      <ul>
        <li>
          <h3><a href="https://teamtreehouse.com">Treehouse</a></h3>
          <p>Front End <em>Web Development</em> Techdegree</p>
          <p class="date special">Graduated January 2020</p>
        </li>
      </ul>
    </section>
    <section id="experience">
      <h2>Experience</h2>
      <ul>
        <li>
          <h3>Super Web Design Shop</h3>
          <p>Junior Developer</p>
          <p class="date special">February 2020-present</p>
        </li>
        <li>
          <h3>Pretty Good Websites, Inc.</h3>
          <p>Web Development Intern</p>
          <p class="date">July 2019-January 2020</p>
        </li>
      </ul>
    </section>
    <section>
      <h2>Skills</h2>
      <ul id="skills-list">
        <li class="top-skill">HTML</li>
        <li>CSS</li>
        <li class="top-skill" id="proud">JavaScript</li>
        <li>Git</li>
        <li>Bootstrap</li>
        <li class="top-skill">Mobile Web Development</li>
        <li>Accessibility</li>
      </ul>
    </section>
    <section>
      <h2>Awards and Achievements</h2>
      <ol>
        <li>Dev Ninja Award, November 2020</li>
        <li>Developer of the Month, October 2019</li>
        <li>Achieved rating of 6 kyu on <a href="https://www.codewars.com/">Codewars</a></li>
        <li>Certified Accessibility Specialist</li>
      </ol>
    </section>
    <footer>©2020 Developer Diane.</footer>
  </main>
</body>
</html>

Answer 1 · 2021-04-02T21:53:07Z

April 2, 2021 9:53pm

Hi Shayne!

This passes all 3 tasks:

/* Complete the challenge by writing CSS below */

html {
  font-size: 16px;
}

header {
  font-size: 1.5em;
}

.heading {
  font-size: 5rem; /***  Task 1  ***/
/***  Because "rem" is relative to the root element of the page  ***/
}

h2 {
  font-size: 3em; /***  Task 2  ***/
/***  Becuase 3 * 16px = 48px  ***/
}

h3 {
  font-size: 1.25em; /***  Task 3  ***/
/***  Because 1.25 * 16px = 20px  ***/
}