how to customize search results ?

Hello to all my friends and teachers, I have a question, I wanted search results to be displayed in 3 columns.

search.php codes:

<?php global $wp_query?>
<?php get_header()?>

  <div class="title-wrapper"><div class="title-bg"></div>
  <div class="title clearfix">
    <h1>search results/h1>
    <div id="drag_btn" href="#"></div>
    <div id="slide_btn" href="#"></div>
  </div></div>
  <div id="freespace-title"></div>

  <div class="content-wrapper nosidebars clearfix">
  <div class="content clearfix">

      <?php teardrop_breadcrumb_nav()?>
   <div class="article" id="single">
      <h2>search for<?php echo get_search_query()?>: <?php echo $wp_query->post_count?> results/h2>
      <?php while(have_posts()):the_post()?>
      <div class="search-results" style="width: 250px; position: relative; left: -10px;">

              <h4><a href="<?php the_permalink()?>"><?php the_title()?></a></h4>
		<?php if ( has_post_thumbnail() ) { the_post_thumbnail(array(400,400)); } ?>
     </div>
      <?php endwhile?>
    </div>
  </div>
  </div>
  <div id="freespace"></div>
<?php get_footer()?>