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

HTML How to Make a Website Styling Web Pages and Navigation Make a CSS Image Gallery

Tshepo Rakgoale
Tshepo Rakgoale
3,142 Points
Posted by Tshepo Rakgoale
Tshepo Rakgoale
3,142 Points

what difference does it make when using 50px , 50em and 50%?

when can one apply % , px and em? i'm totally blown away and what is a parent ?

css/main.css 
a {
  text-decoration: none;
}

img{
margin :0;
max-width:2.5%;
}

#wrapper {
  max-width: 940px;
  margin: 0 auto;
}

#logo {
  text-align: center;
  margin: 0;
}

h1, h2 {
  color: #fff;
}

nav a {
  color: #fff;
}

nav a:hover {
  color: #32673f;
}

h1 {
  font-family: Changa One, sans-serif;
  font-size: 1.75em;
  font-weight: normal;
}

1 Answer

Shane Oliver
Shane Oliver
19,977 Points
Shane Oliver
Shane Oliver
19,977 Points

50px is 50 pixels. 50em is 50 times the documents base font size. 50% is 50% of the elements parent container when dealing with width and height. For font-size 50% will be 50% of the initial size.