FAQ: Sizing Elements - Em

This community-built FAQ covers the “Em” exercise from the lesson “Sizing Elements”.

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This exercise can be found in the following Codecademy content:

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Learn Responsive Design

FAQs on the exercise Em

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so in what cases, we have to use px and when em? thanks

The example used in this task has left me quite confused. It states that the font-size of 1.5em is equal to 27 pixels, but surely it should be 24 pixels (16 * 1.5)?

Is there any details I am missing?



1 Like

16 pixels is the default font size, but here font size is defined as 18 pixels. So the font size of h1 elements will be 18*1.5=27


Whoops, I missed the default 18px font size size.

Thank you!

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Hi question about em and rem units. If we are hard-coding the base font size and root element font size in px, wouldn’t the value of the em and rem units always be the same regardless of browser size because the values the relative too are hard coded? Wouldn’t this defeat the purpose of responsive design?

Hello! I’m working on the Bana’s Travel Blog exercise and for question #1, it asks us to set the font size to 1.5 em in #banner h1. Here is my code:

#banner h1 {

font-family: ‘Roboto’, sans-serif;
font-weight: 300;
font-size: 1.5em;
color: white;


The font size increases, but I still receive an error message: Did you sent the font size to 1.5em?

It seems to me that this is what I’ve done. I include a screenshot.

Thanks for any helpful commentary!

I failed to get past the first question without getting the solution. Which looked the same as my answer-- which was rejected. Is this a bug?


Hiya, I also get the same message. I will try to report it as a bug. The solution looks much the same as mine. And the same problem occurs in the next exercise…

Same problem here I also reported that as a bug waiting for a fix or an answer.

This still has not been fixed.