Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

CSS CSS Basics (2014) Understanding Values and Units Em and Rem Units

Maciej Reimann
Maciej Reimann
12,377 Points

The h2 font-size value (16px) in em units is 3.313em. Changes in the code doesn't affect the preview. Is there a bug?

Hi, In this challenge I was supposed to convert 53px into em units, given the root element's value of 16px it shoud be 3.313 ems. I have no idea what I am doing wrong. Besides, changing the css code doesnt affect the preview at all. Why? Thank you for your help, I'd really like to go further with this :)

/* Complete the challenge by writing CSS below */

header {
  font-size: 1.8em;

.title {
  font-size: 1.625rem;

h1 {
  font-size: 5.625rem;

h2 {
  font-size: 3.313em;
<!DOCTYPE html>
    <title>Lake Tahoe</title>
    <link rel="stylesheet" href="page.css">
    <link rel="stylesheet" href="style.css">
      <span class="title">Journey through the Sierra Nevada Mountains</span>
      <h1>Lake Tahoe, California</h1>
    <div class="main-content">
        Lake Tahoe is one of the most breathtaking attractions located in California. It's home to a number of ski resorts, summer outdoor recreation, and tourist attractions. Snow and skiing are a significant part of the area's reputation.
      <a href="#">Find out more</a>
      <h2>Check out all the Wildlife</h2>
        As spawning season approaches, the fish acquire a humpback and protuberant jaw. After spawning, they die and their carcasses provide a feast for gatherings of mink, bears, and Bald eagles.
      <a href="#">See the Wildlife</a>
      <h3>From Tents to Resorts</h3>
        Lake Tahoe is full of wonderful places to stay. You have the ability to sleep in the outdoors in a tent, or relax like a king at a five star resort. Here are our top three resorts:
      <p>All rights reserved to the state of <a href="#">California</a>.</p>
      <a href="#top">Back to top &raquo;</a>

2 Answers

Jenna Dercole
Jenna Dercole
30,224 Points

Hey Maciej -- I think the only thing preventing you from passing this challenge is the fact that your h2 em value is rounded. Try entering 3.3125 instead of 3.313 as your em value and see if that helps. :)

Maciej Reimann
Maciej Reimann
12,377 Points

Hey! Yesss! You're right. Thank you for the quickest response ever. :)