My website just isn't lining up correctly like the tutorial.

<div class="container clearfix">
  <div class="grid_4">
   <img src="img/logo.gif" alt="Smells Like Bakin">
  </div>
  <div class="grid_8 omega">
    <ul class="nav">
      <li><a href="a">About</a></li>
      <li><a href="a">Cupcakes &amp; Prices</a></li>
      <li><a href="a">Locations</a></li>
      <li class"last"><a href="a">Contact Us</a></li>
    </ul>
  </div>

  <div id="intro" class="grid_9">
    <h1>Opposites really do attract, especially in our kitchen! We combine unexpected flavors that melt together to create ironically delicious desserts.<h1/>
      <p><a href="#" class="btn">Browse Our Cupcakes</a></p>
    </div>
  <div class="grid_3>"
  <img src="img/you-bake-me-blush.gif" alt="You Bake Me Blush">
  </div>

  <div id="featured-cupcake" class="grid_7">
    <h2>Cupcake of the Week</h>
      <p>This week's featured Cupcake is the <a href="#">Avocado Chocolate Cupcake</a> Its strange combo of flavors will make your face explode!</p>
      <img src="img/featured-cupcake.jpg" alt="Avocado Cupcake">
    </div>

  <div id="new-cupcakes" class"grid_5 omega">
  <h2>Fresh Out The Oven</h2>
  <p>Our newest cupcakes are <a href="#">Bacon Me Crazy</a> and <a href ="#">Jalapeno So Spicy</a>. </p>
    <img src="img/new-cupcake-bacon.jpg" alt"Bacon Me Crazy">
    <img src="img/new-cupcake-jalapeno.jpg" alt="Jalapeno So Spicy">
  </div>

  <div class"grid_7">
      <h2>Inside the Kitchen</h2>
      <p> Smells Like Bakin’ started out in the garage of the husband wife duo Allison &amp; Joseph. Allison is the baker, and Joseph found a way for them to make a business out of her tasty treats. Flash forward to today and they have a successful store front, catering business and cupcake truck. </p>
      <p><a href="#" class="btn-small">Read More</a></p>
    </div>


     <h2>Get Bakin’ with Us</h2>
     <div id="contact">
    <p>Call us: <span>1-800-CUP-CAKE</span><br>
    Email us: <a href="#">bakeon@smellslikebakin.com</a></p>
  </div>

  <p>We announce all of our new flavors first through Facebook, Twitter, &amp; even take requests!</p>   
  <a href="http://www.facebook.com/SmellsLikeBakin"><img src="img/facebook.gif" alt="Facebook"></a>
  <a href="https://twitter.com/#!/smellslikebakin"><img src="img/twitter.gif" alt="Twitter"></a>

<div id="copyright">
  <p>&copy; 2012 Smells Like Bakin' Cupcake Company. All Rights Reserved.</p>
</div>