Replace the ‘#textbox’ html with the following and css:
<div class="textbox">
<div class="textbox_left">
<p class="txtclhome"><?php dynamicnews_display_thumbnail_index(); ?> </p>
</div>
<div class="textbox_right">
<h3 class="titlehome"><a href="https://wordpress.stackexchange.com/questions/166010/<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h3>
<p class="txtclrhome"><?php the_content_limit(150, ""); ?>
<a class="morelink" href="http://styleposts.com/?cat=41" rel="bookmark"><?php _e("Read More", 'organicthemes'); ?></a></p> </div>
</div>
</div>
.textbox{
overflow: hidden;
}
.textbox_left{
width: 60%;
float: left;
}
.textbox_right{
width: 38%;
float: right;
}