How to make php codes available in the page while working in wordpress page editor?

The following is the code I have used for creating a template for a particular page of my website. Since, its a pre-conference and an independent event. I need to design this page slightly different from what I have used for the home page.

so, I have copied the page.php and try to modify the template.

What I want is.

  1. I need to use the php codes in the page in the wordpress page(because i need to do some query from my database and print it in the current page).

  2. left sidebar should be the navigation menu(custom).

May be this is the rough.
enter image description here

<?php
/**
 * Template Name:theme-meeting-template
 * This template will only display the content you entered in the page editor
 */
?>
 
<?php
/**
 * The template for displaying all pages.
 *
 * This is the template that displays all pages by default.
 * Please note that this is the WordPress construct of pages
 * and that other 'pages' on your WordPress site will use a
 * different template.
 *
 * @package panoramic
 */

 ?>

<html <?php language_attributes(); ?>>
<head>
<meta charset="<?php bloginfo( 'charset' ); ?>">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="profile" href="http://gmpg.org/xfn/11">
<link rel="pingback" href="<?php bloginfo( 'pingback_url' ); ?>">

<?php wp_head(); ?>
<div class="theme-head">
<h1>
The Fourth DAE-BRNS Theme Meeting on
Generation and use of Covariance
Matrices in the Applications of Nuclear Data</h1>
<h2> December 09-13, 2017 </h2>
<h2> Manipal University, Manipal, India </h2>
</div>

<div class="hor-nav" style="color: red; margin-top:20px; display: block">

<ul>

<li >
<a href="http://iclaa2017.com/test-template/">
home 
</a>
</li>
<li >
<a href="#meetings">
Meetings </a>
</li>
</ul>

</div>

</head>

<body <?php body_class(); ?>>




<?php 
get_sidebar();
?>




<div id="content" class="site-content site-container" >

    
    <?php if ( ! is_front_page() ) : ?>
    
        <?php if ( function_exists( 'bcn_display' ) ) : ?>
        <div class="breadcrumbs">
            <?php bcn_display(); ?>
        </div>
        <?php endif; ?>
        
    <?php endif; ?>

	<div id="primary" class="content-area">
	
		<main id="main" class="site-main" role="main">
            
            <?php get_template_part( 'library/template-parts/page-title' ); ?>

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

				<?php get_template_part( 'library/template-parts/content', 'page' ); ?>

				<?php
					// If comments are open or we have at least one comment, load up the comment template
					if ( comments_open() || get_comments_number() ) :
						comments_template();
					endif;
				?>

			<?php endwhile; // end of the loop. ?>

		</main><!-- #main -->
	</div><!-- #primary -->

    
<?php get_footer(); ?>

Kindly click here for the output

Why the CSS styles are not working in sidebars??

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