Full width pade for twenty thirteen theme

Hello, I am using a 2013 child theme, but I can’t get a full-width template.

I have tried various thing, and I am reporting here what seems to be the most suggested on forums – yet it didn’t work for me.

I copied the page.php and renamed it FullWidth.php in the twentythirteen-child theme folder (I left also page.php).

In full-width.php, I changed the first few lines and added the style=”100%” attribute:

<?php
/*
Template Name: FullWidth
*/ 

get_header(); ?>

	<div id="primary" class="content-area" style="width:100%">
		<div id="content" class="site-content" role="main" style="width:100%">

			<?php /* The loop */ ?>
			<?php while ( have_posts() ) : the_post(); ?>

				<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
					<header class="entry-header">
						<?php if ( has_post_thumbnail() && ! post_password_required() ) : ?>
						<div class="entry-thumbnail">
							<?php the_post_thumbnail(); ?>
						</div>
						<?php endif; ?>

						<h1 class="entry-title"><?php the_title(); ?></h1>
					</header><!-- .entry-header -->

					<div class="entry-content">
						<?php the_content(); ?>
						<?php wp_link_pages( array( 'before' => '<div class="page-links"><span class="page-links-title">' . __( 'Pages:', 'twentythirteen' ) . '</span>', 'after' => '</div>', 'link_before' => '<span>', 'link_after' => '</span>' ) ); ?>
					</div><!-- .entry-content -->

					<footer class="entry-meta">
						<?php edit_post_link( __( 'Edit', 'twentythirteen' ), '<span class="edit-link">', '</span>' ); ?>
					</footer><!-- .entry-meta -->
				</article><!-- #post -->

				<?php comments_template(); ?>
			<?php endwhile; ?>

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

<?php get_footer(); ?>

Finally, I selcted the FullWidth template in the page options (quick edit –> template –> FullWidth)

Any ideas why it is not working?

https://guhu.website/?page_id=143