Add No Sidebar template

no-sidebar.php

@@ -0,0 +1,31 @@
+<?php
+/*
+Template Name: No Sidebar
+*/
+?>
+<?php
+get_header();
+?>
+
+	<div id="primary" class="content-area no-sidebar">
+		<main id="main" class="site-main">
+
+		<?php
+		while ( have_posts() ) :
+			the_post();
+
+			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();
+			endif;
+
+		endwhile; // End of the loop.
+		?>
+
+		</main><!-- #main -->
+	</div><!-- #primary -->
+
+<?php
+get_footer();

style.css

@@ -961,6 +961,10 @@ Site content
     max-width: 100%;
 }
 
+.content-area.no-sidebar {
+    grid-column: 4 / 10;
+}
+
 .widget-area {
     grid-column: 9 / 11;
     max-width: 100%;