Hi alchymyth and vthanks for your interest.
The theme I’m using is Customizr 3.1.22 and it has not page.php,
following the full code of the index.php:
<?php
/**
* The main template file. Includes the loop.
*
*
* @package Customizr
* @since Customizr 1.0
*/
?>
<?php do_action( '__before_main_wrapper' ); ##hook of the header with get_header ?>
<div id="main-wrapper" class="<?php echo tc__f( 'tc_main_wrapper_classes' , 'container' ) ?>">
<?php do_action( '__before_main_container' ); ##hook of the featured page (priority 10) and breadcrumb (priority 20)...and whatever you need! ?>
<div class="container" role="main">
<div class="<?php echo tc__f( 'tc_column_content_wrapper_classes' , 'row column-content-wrapper' ) ?>">
<?php do_action( '__before_article_container'); ##hook of left sidebar?>
<div id="content" class="<?php echo tc__f( '__screen_layout' , tc__f ( '__ID' ) , 'class' ) ?> article-container">
<?php do_action ('__before_loop');##hooks the header of the list of post : archive, search... ?>
<?php if ( tc__f('__is_no_results') || is_404() ) : ##no search results or 404 cases ?>
<article <?php tc__f('__article_selectors') ?>>
<?php do_action( '__loop' ); ?>
</article>
<?php endif; ?>
<?php if ( have_posts() && !is_404() ) : ?>
<?php while ( have_posts() ) : ##all other cases for single and lists: post, custom post type, page, archives, search, 404 ?>
<?php the_post(); ?>
<?php do_action ('__before_article') ?>
<article <?php tc__f('__article_selectors') ?>>
<?php do_action( '__loop' ); ?>
</article>
<?php do_action ('__after_article') ?>
<?php endwhile; ?>
<?php endif; ##end if have posts ?>
<?php do_action ('__after_loop');##hook of the comments and the posts navigation with priorities 10 and 20 ?>
</div><!--.article-container -->
<?php do_action( '__after_article_container'); ##hook of left sidebar ?>
</div><!--.row -->
</div><!-- .container role: main -->
<?php do_action( '__after_main_container' ); ?>
</div><!--#main-wrapper"-->
<!-- ===================================== -->
<?php
$args = array( 'post_type' => 'page', 'numberposts' => 1, 'orderby' => 'rand' );
$rand_posts = get_posts( $args );
foreach( $rand_posts as $post ) : ?>
<a href="<?php the_permalink(); ?>"><?php the_title(); ?></a>
<?php the_content(); ?>
<?php endforeach; ?>
<!-- ===================================== -->
<?php do_action( '__after_main_wrapper' );##hook of the footer with get_get_footer ?>