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!

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

Posted by Tyler York
Tyler York
8,177 Points

Why would "margin: 0;" tell me not all sides have zero margin?

I'm confused as to why setting a margin of 0 wouldn't automatically assign it to all sides.

#gallery ul {
  margin: 0;
  padding: 0;
 list-style-type: none;
}
css/main.css 
a {
  text-decoration: none;
}

#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;
}

img {
  max-width: 100%;
}

#gallery ul {
  margin: 0;
  padding: 0;
  list-style-type: none;
}

1 Answer

Rich Donnellan
MOD
Rich Donnellan
Treehouse Moderator 25,960 Points
Rich Donnellan
Rich Donnellan
Treehouse Moderator 25,960 Points

Tyler,

The margin property is shorthand for margin-top, margin-right, margin-bottom and margin-left. It's typically easier to use this to avoid having to list out each one separately.

margin: 0; // is equivalent to 
margin: 0, 0, 0, 0; // margin: top, right, bottom, left — or
margin-top: 0;
margin-right: 0;
margin-bottom: 0;
margin-left: 0;

Check out the Mozilla Developer Network (MDN) for more information — great resource.

–Rich