I am getting trouble using blogging platforms I am attempting to float an excerpt text box right hands side from the page although still keeping it left aligned. I have attempted aiming the PHP right which place the position right but additionally lines up in the right. I am unsure about connecting the CSS with just the excerpts PHP.

This is actually the PHP above &lifier CSS below

<?php get_header(); ?>

<div id="content">
 <div id="entry_content">
 <?php if (have_posts()) : ?>

 <?php while (have_posts()) : the_post(); ?>

  <?php if(is_home()) { if ( function_exists('wp_list_comments') ) { ?>  <div <?php   post_class(); ?>> <?php }} ?>

 <!--<h2 class="title"><a href="<?php the_permalink() ?>" rel="bookmark"      title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h2>
      <p class="date"><?php the_time('F jS, Y') ?> <?php comments_popup_link('&sect; <span class="commentcount">0 comments</span>', '&sect; <span class="commentcount">1 comment</span>', '&sect; <span class="commentcount">% comments</span>'); ?></p>-->

       <div class="post">

 <?php { if ( function_exists('add_theme_support')) the_post_thumbnail( 'post-thumbnail' ); } ?>      

 <?php the_content('&raquo; Read the rest of this entry &laquo;'); ?>  
    <div class="pagination">
      <?php wp_link_pages(array('before' => '<p><span>Page</span>', 'after' => '</p>',       'next_or_number' => 'number')); ?>
    </div>

 </p><?php the_excerpt(); ?></p></a></div>
  </div>

    <p class="tags"><?php the_tags('<span>Tagged </span> ', ', ', ''); ?></p>

  <?php endwhile; ?>

  <div class="navigation">
    <p class="alignleft"><?php next_posts_link('&laquo; Older Entries') ?></p>
        <p class="alignright"><?php previous_posts_link('Newer Entries &raquo;') ?></p>
  </div>

   <?php else : ?>

  <div class="entry">
   <span class="error"><img src="<?php bloginfo('template_directory'); ?      >/images/mal.png"       alt="error duck" /></span>
    <p>Hmmm, seems like what you were looking for isn't here.  You might want to give      it   another try - the server might have hiccuped - or maybe you even spelled something wrong (though it's more likely <strong>I</strong> did).</p>
   </div>

<?php endif; ?>

</div> <!-- close entry_content -->

<?php get_sidebar(); ?>

CSS:

/* =Layout
------------------------------------------------------------------*/
 #wrapper {
width: 75em;
margin: 0 ;
 }

 #header {
  display: block;
 }

 #main_nav {
width: 0em;
margin: -1.8em 0 0 0;
float: left;
display: inline;
    position: fixed;
    width: 120px;
height: 100%;
    padding: 0em 0em 0em 3em;
background: #f5f5f5
 }

 {TO POSITION THE PAGE TEMPLATE CHANGE WIDTH & MARGIN=HEIGHT}

 #content {
width: 55em;
margin: 1em 0 0 0;
float: right;
display: inline;
min-height: 30em;
 }

  #post_content {
width: 100em;
margin: 10em 2.5em 0 1.5em;
float: left;
display: inline;
  }

  {TO POSITION THE POSTS TEMPLATE CHANGE WIDTH & MARGIN=HEIGHT}

 .post {
    width: 83em;
margin: 1.5em 0 0 0;
float: right;
display: inline;
min-height: 30em;
 }
 #content {
width: 55em;
margin: 1em 0 0 0;
float: right;
display: inline;
min-height: 30em;
text-align:left;
 }