I have some recommendations for your question:

**First**: stop using `query_posts()`. See [the codex about this function][1] to see why you shouldn't use it in themes or plugins. Anyway, if you are in a some weird situation where you have not option and you need to use `query_posts()`, you should run `wp_reset_query()` after the loop. You must know that you are using the `global $wp_query`, that contains the original query made by WordPress, and then `query_post` that alter the `global $wp_query` variable, you end up with unexpected results. Additionally, you are using a deprecated parameter `showposts`, replaced by `posts_per_page`.

**Second**: you can use a custom search template (search.php) to customize the look and feel. Just cerate a search.php file in your theme folder and customize it as you want. **Don't make custom queries here**; if you do that, you are making a new query for posts and wasting the query already done by WordPress. A waste of resources with negative performance impact.

**Third**: to change the default query parameters used by WordPress, like number of posts per page, etc, you can use [`pre_get_posts` action][2].

So, create a your search.php template as you wish and use `pre_get_posts` action to say to WordPress what parameters you want to use in the search query:

The search.php template could be something like this:

    <?php
    get_header();
    global $wp_query;
    ?>
    <div class="wapper">
      <div class="contentarea clearfix">
        <div class="content">
          <h1 class="search-title"> <?php echo $wp_query->found_posts; ?>
            <?php _e( 'Search Results Found For', 'locale' ); ?>: "<?php the_search_query(); ?>" </h1>
    
    	    <?php if ( have_posts() ) { ?>
    
                <ul>
    
    		    <?php while ( have_posts() ) { the_post(); ?>
    
                   <li>
                     <h3><a href="<?php echo get_permalink(); ?>">
                       <?php the_title();  ?>
                     </a></h3>
                     <?php  the_post_thumbnail('medium') ?>
                     <?php echo substr(get_the_excerpt(), 0,200); ?>
                     <div class="h-readmore"> <a href="<?php the_permalink(); ?>">Read More</a></div>
                   </li>
    					
    		    <?php } ?>
    
                </ul>

               <?php echo paginate_links(); ?>
      
    		<?php } ?>
    
        </div>
      </div>
    </div>
    <?php get_footer(); ?>

And the `pre_get_posts` action something like this:

    add_action( 'pre_get_posts', function( $query ) {
    
        // Check that it is the query we want to change: front-end search query
        if( $query->is_main_query() && ! is_admin() && $query->is_search() ) {
    
            // Change the query parameters
            $query->set( 'posts_per_page', 3 );
    
        }
    
    } );


  [1]: https://codex.wordpress.org/Function_Reference/query_posts
  [2]: https://codex.wordpress.org/Plugin_API/Action_Reference/pre_get_posts