Twenty Seven page width adjustment

I use WP as a Photo gallery. Updated to twentyseven and cannot increase the page width anymore.
In twentysix I increased the page width in its child theme as follows:
page-wide.php;
<?php
get_header(); ?>
<div id=”primary” class=”content-area-wide”>
<main id=”main” class=”site-main” role=”main”>
<?php
// Start the loop.
while ( have_posts() ) : the_post();
// Include the page content template.
get_template_part( ’template-parts/content’, ‘page’ );
// If comments are open or we have at least one comment, load up the comment template.
if ( comments_open() || get_comments_number() ) {
comments_template();
}
// End of the loop.
endwhile;
?>
</main><!– .site-main –>
<?php get_sidebar( ‘content-bottom’ ); ?>
</div><!– .content-area-wide –>
<?php get_footer(); ?>

AND

style.css;

.content-area-wide {
float: left;
margin-right: -100%;
width: 100%;
}

.content-area-wide .entry-content {
margin-right: 5%;
margin-left: 5%;
}

How to adapt in Twenty Seven?