Using CSS3 transition to increase block width on mouse hover

blocks.html

<div id="wrap">
  <div id="blocks">
    <section id="news" class="box">
      <header><h1 class="script">Latest News</h1></header>
      <article class="news-post">
        <header>
          <h1><a href="#">Border &amp; Radius Named to City's Best List</a></h1>
        </header>	
        <p><time datetime="2011-01-26" pubdate>Monday, January 26, 2011</time> | <span class="via">via</span> <a href="#">The Newspaper</a></p>
      </article>
      <article class="news-post">
        <header>
          <h1><a href="#">Another Newsworthy Item Goes Here</a></h1>
        </header>	
        <p><time datetime="2011-01-26" pubdate>Monday, January 26, 2011</time> | <span class="via">via</span> <a href="#">The Newspaper</a></p>
      </article>
      <article class="news-post">
        <header>
        <h1><a href="#">Hey Look, We're In The News Again</a></h1>
        </header>	
        <p><time datetime="2011-01-26" pubdate>Monday, January 26, 2011</time> | <span class="via">via</span> <a href="#">The Newspaper</a></p>
      </article>
      <article class="news-post">
        <header>
          <h1><a href="#">I'll Have a Pint of Guinness Please</a></h1>
        </header>	
        <p><time datetime="2011-01-26" pubdate>Monday, January 26, 2011</time> | <span class="via">via</span> <a href="#">The Newspaper</a></p>
      </article>		
    </section>
  </div>
</div>

transition.css

.news-post {
  margin-top: 6px;
  padding: 5px 0 5px 10px;
  width: 285px;
  -webkit-border-top-right-radius: 10px;
  -webkit-border-bottom-right-radius: 10px;
  -moz-border-radius-topright: 10px;
  -moz-border-radius-bottomright: 10px;
  border-top-right-radius: 10px;
  border-bottom-right-radius: 10px;

  -webkit-transition: width .2s linear, background .3s ease-in-out;;
  -moz-transition: width .2s linear, background .3s ease-in-out;;
  transition: width .2s linear, background .3s ease-in-out;

}

.news-post:hover {
  width: 300px;
  background: rgba(208, 208, 198, .5);
}