adding fresh FoundationPress theme from scratch

FoundationPress/404.php

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+<?php
+/**
+ * The template for displaying 404 pages (not found)
+ *
+ * @package FoundationPress
+ * @since FoundationPress 1.0.0
+ */
+
+get_header(); ?>
+
+<div class="main-container">
+	<div class="main-grid">
+		<main class="main-content">
+			<article>
+				<header>
+					<h1 class="entry-title"><?php _e( 'File Not Found', 'foundationpress' ); ?></h1>
+				</header>
+				<div class="entry-content">
+					<div class="error">
+						<p class="bottom"><?php _e( 'The page you are looking for might have been removed, had its name changed, or is temporarily unavailable.', 'foundationpress' ); ?></p>
+					</div>
+					<p><?php _e( 'Please try the following:', 'foundationpress' ); ?></p>
+					<ul>
+						<li>
+							<?php _e( 'Check your spelling', 'foundationpress' ); ?>
+						</li>
+						<li>
+							<?php
+								/* translators: %s: home page url */
+								printf(
+									__( 'Return to the <a href="%s">home page</a>', 'foundationpress' ),
+									home_url()
+								);
+							?>
+						</li>
+						<li>
+							<?php _e( 'Click the <a href="javascript:history.back()">Back</a> button', 'foundationpress' ); ?>
+						</li>
+					</ul>
+				</div>
+			</article>
+		</main>
+		<?php get_sidebar(); ?>
+	</div>
+</div>
+<?php get_footer();