Can't get the pictures in a horizontal view, they just stay vertical. (FOUND SOLUTION)

Question

Like many others I can't get the pictures to be next to each other, no matter how much I zoom in they just stay in a vertical line. I even tried other peoples code which they say work but still no luck. I'm going to paste my code if anyone is interested in finding the problem. I use Chrome on a Macbook Pro. (Also, a tip for zooming in more than 400px, press alt+cmd+J and click the mobile-logo, this will allow you to size it really small.)

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Baltzar | Design </title>
    <link rel="stylesheet" href="css/normalize.css">
    <link href='http://fonts.googleapis.com/css?family=Changa+One|Open+Sans:400italic,700italic,400,700,800' rel='stylesheet' type='text/css'>
    <link rel="stylesheet" href="css/main.css">
  </head>
  <body>
    <header>
      <a href="index.html" id="logo">
        <h1>Nick Pettit</h1>
        <h2>Design</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 id="gallery">
            <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 witih...</p>
            </a>
          </li>
          <li>
            <a href="img/numbers-06.jpg">
              <img src="img/numbers-06.jpg" alt="">
              <p>Trying..</p>
            </a>
          </li>
          <li>
            <a href="img/numbers-09.jpg">
              <img src="img/numbers-09.jpg" alt="">
              <p>Drips.</p>
            </a>
          </li>
          <li>
            <a href="img/numbers-12.jpg">
              <img src="img/numbers-12.jpg" alt="">
              <p>Creating shapes,..</p>
            </a>
          </li>        
        </ul>
      </section>
      <footer>
        <a href="http://www.google.se/"><img src="img/twitter-wrap.png" alt="Twitter Logo"></a>
        <a href="http://www.facebook.com/"><img src="img/facebook-wrap.png" alt="Facebook Logo"></a>
        <p>&copy; 2015 Baltzar Mattsson.</p>
      </footer>
    </div>
  </body>
</html>

/**************************
GENERAL
**************************/

body {
  font-family: 'Open Sans', sans-serif;
}

#wrapper {
  max-width: 940px;
  margin: 0 auto;
  padding: 0 5%;
}

a {
  text-decoration: none;
}

img {
  max-width: 100%;
}



/**************************
HEADING
**************************/

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

h1 {
  font-family: 'Changa One', sans-serif;
  margin: 15px 0;
  font-size: 1.75em;
  font-weight: normal;
  line-height: 0.8em;
}

h2 {
  font-size: 0.75em;
  margin: -5px 0 0;
  font-weight: normal;
}



/**************************
NAVIGATION
**************************/

nav {
  text-align: center;
  padding: 10px 0;
  margin: 20px 0 0;

}



/**************************
FOOTER
**************************/

footer {
  font-size: 0.75em;
  text-align: center;
  padding-top: 50px;
  color: #ccc;
}


/**************************
PAGE PORTFOLIO
**************************/

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

#gallery li {
  float: left;
  width: 45%;
  margin: 2.5%;
  background-color: #f5f5f5;
  color: #bdc3c7;
}

/**************************
COLORS
**************************/

/* site body */
body {
  background-color: #fff;
  color: #999;
}

/* green header */
header {
  background: #6ab47b;
  border-color: #599a68;
}

/* nav background on mobile */
nav {
  background: #599a68;
}

/* logo text */
h1, h2 {
  color: #fff;
}

/* links */
a {
  color: #6ab47b;
}

/* nav link */
nav a, nav a:visited {
  color: #fff;
}

/* selected nav link */
nav a.selected, nav a:hover {
  color: #32673f;
}

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Baltzar Mattsson

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Can't get the pictures in a horizontal view, they just stay vertical. (FOUND SOLUTION)

Baltzar Mattsson

Baltzar Mattsson