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 How to Make a Website CSS: Cascading Style Sheets Style the Basic Elements

Killeon Patterson
Killeon Patterson
18,214 Points

What is the issue with my syntax for centering the margin?

What is incorrect with the syntax for centering the margin?

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

}
#wrapper{
max-width: 940px;
margin: center;
}
index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Nick Pettit | Designer</title>
    <link rel="stylesheet" href="css/normalize.css">
    <link rel="stylesheet" href="css/main.css">
  </head>
  <body>
    <header>
      <a href="index.html" id="logo">
        <h1>Nick Pettit</h1>
        <h2>Designer</h2>
      </a>
      <nav>
        <ul>
          <li><a href="index.html" class="selected">Portfolio</a></li>
          <li><a href="about.html">About</a></li>
          <li><a href="contact.html">Contact</a></li>
        </ul>
      </nav>
    </header>
    <div id="wrapper">
      <section>
        <ul>
          <li>
            <a href="img/numbers-01.jpg">
              <img src="img/numbers-01.jpg" alt="">
              <p>Experimentation with color and texture.</p>
            </a>
          </li>
          <li>
            <a href="img/numbers-02.jpg">
              <img src="img/numbers-02.jpg" alt="">
              <p>Playing with blending modes in Photoshop.</p>
            </a>
          </li>
          <li>
            <a href="img/numbers-06.jpg">
              <img src="img/numbers-06.jpg" alt="">
              <p>Trying to create an 80's style of glows.</p>
            </a>
          </li>
          <li>
            <a href="img/numbers-09.jpg">
              <img src="img/numbers-09.jpg" alt="">
              <p>Drips created using Photoshop brushes.</p>
            </a>
          </li>
          <li>
            <a href="img/numbers-12.jpg">
              <img src="img/numbers-12.jpg" alt="">
              <p>Creating shapes using repetition.</p>
            </a>
          </li>
        </ul>
      </section>
      <footer>
        <a href="http://twitter.com/nickrp"><img src="img/twitter-wrap.png" alt="Twitter Logo"></a>
        <a href="http://facebook.com/nickpettit"><img src="img/facebook-wrap.png" alt="Facebook Logo"></a>
        <p>&copy; 2014 Nick Pettit.</p>
      </footer>
    </div>
  </body>
</html>

2 Answers

Use margin: auto;

Niclas Valentiner
Niclas Valentiner
8,947 Points

center is not a valid value for the margin property but you're close!

//This sets the top and bottom margins to 0 and evenly splits the left and right sides effectively centering your element
margin: 0 auto;