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

Kateryna Voloshyna
Kateryna Voloshyna
1,754 Points
Posted by Kateryna Voloshyna
Kateryna Voloshyna
1,754 Points

can't understand based on what I need to calculate h3 font-size

The task wants me to set the h3 element font-size in em, and it should be 20px equivalent. Since the h3 tag is the body tag dscendant, and we haven't overridden the deafult browser's rule of 1em=16px, why doesn't it accept my 1.25em font-size and writes somthing about 53px and h2 tag?

style.css 
/* 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: 3.3125rem;
}

h3{
  font-size:1.25em;
}
index.html 
<!DOCTYPE html>
<html>
  <head>
    <title>Lake Tahoe</title>
    <link rel="stylesheet" href="page.css">
    <link rel="stylesheet" href="style.css">
  </head>
  <body>
    <header>
      <span class="title">Journey through the Sierra Nevada Mountains</span>
      <h1>Lake Tahoe, California</h1>
    </header>
    <div class="main-content">
      <p>
        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.
      </p>
      <a href="#">Find out more</a>
      <h2>Check out all the Wildlife</h2>
      <p>
        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.
      </p>
      <a href="#">See the Wildlife</a>
      <h3>From Tents to Resorts</h3>
      <p>
        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>
    </div>
    <footer>
      <p>All rights reserved to the state of <a href="#">California</a>.</p>
      <a href="#top">Back to top &raquo;</a>
    </footer>
  </body>
</html>

1 Answer

Christopher van Ruitenbeek
Christopher van Ruitenbeek
13,705 Points
Christopher van Ruitenbeek
Christopher van Ruitenbeek
13,705 Points

Perhaps it is because your header comes before the h3 tag, and that tag uses an 'em' value.

So I think the h3 tag is actually taking the 1.8em font-size as a reference, instead of the root. Maybe you could try and change both values to rem values, instead of em values.