Hard to fine this code.

What Div or Class name used inside the red line?

A quick note - in case you intend to change theme files -

http://codex.wordpress.org/Child_Themes

I hope to release a very basic child theme template tonight so you can modify your site without losing changes.

I just modified the content.php and added bolded...



<div class="newdivclass">
<article class="post-48 post type-post status-publish format-standard hentry category-illustrations" id="post-48">
    <header class="entry-header">
        <h1 class="entry-title"><a rel="bookmark" title="Permalink to USB Flash Drive vector illustration icon" href="http://cheapvectors.com/usb-flash-drive-vector-illustration-icon/">USB Flash Drive vector illustration icon[/url]</h1>
        <div class="entry-meta"> Posted on <a rel="bookmark" title="2:34 am" href="http://cheapvectors.com/usb-flash-drive-vector-illustration-icon/">
            <time pubdate="" datetime="2013-03-29T02:34:48+00:00" class="entry-date">March 29, 2013</time>
            [/url]<span class="byline"> by <span class="author vcard"><a rel="author" title="View all posts by Jeffrey" href="http://cheapvectors.com/author/Jeffrey/" class="url fn n">Jeffrey[/url]</span></span> </div>
        <!-- .entry-meta -->
    </header>
    <!-- .entry-header -->
    <div class="entry-content">
       
    </div>
    <!-- .entry-content -->
    <footer class="entry-meta"> <span class="cat-links"> Posted in <a rel="category tag" title="View all posts in Illustrations" href="http://cheapvectors.com/category/illustrations/">Illustrations[/url] </span> <span class="sep"> | </span> <span class="comments-link"><a title="Comment on USB Flash Drive vector illustration icon" href="http://cheapvectors.com/usb-flash-drive-vector-illustration-icon/#respond">Leave a comment[/url]</span> <span class="sep"> | </span><span class="edit-link"><a title="Edit Post" href="http://cheapvectors.com/wp-admin/post.php?post=48&amp;action=edit" class="post-edit-link">Edit[/url]</span> </footer>
    <!-- .entry-meta -->
</article>
<div>


added this inside style.css

.newdivclass {
width: 50%;
float: left;
}