View file modules/errors/404.php

<?php
require_once $_SERVER['DOCUMENT_ROOT'].'/system/function.php';
$title_main = 'Error 404 Page Not Found';
require_once SYS.'/head.php';

echo '

		<div class="error">

			<div class="error-logo"></div>

			<div class="error-text">
				<div class="error-title">404</div>
				<div class="error-message">'.$lang['error_404'].'</div>

				<div style="line-height: 1.8;">
					<a href="/">'.$lang['go_home'].'</a>
					<br>'.$lang['or'].'<br>
					<span class="btn play">'.$lang['play_g'].'?</span>
				</div>
			</div>

		</div>

		</section>

		<div class="spec c" style="background: #001277;display: none;">
			<div id="screen" style="margin: 0 auto;position: relative;">
				<span id="go-full" class="full qwe"><i class="material-icons" style="cursor: pointer;position: absolute;width: 48px;height: 48px;line-height: 48px;text-align: center;color: #fff;">fullscreen</i></span>
				<span id="exit-full" class="full qwe" style="display:none;"><i class="material-icons" style="cursor: pointer;position: absolute;width: 48px;height: 48px;line-height: 48px;text-align: center;color: #fff;">fullscreen_exit</i></span>
				<span class="play"><i class="material-icons" style="cursor: pointer;position: absolute;right: 0;width: 48px;height: 48px;line-height: 48px;text-align: center;color: #fff;">close</i></span>
			</div>
			<script src="https://'.$_SERVER['HTTP_HOST'].'/modules/errors/js/phaser.min.js"></script>
			<script src="https://'.$_SERVER['HTTP_HOST'].'/modules/errors/js/index.js"></script>
		</div>

		<script>
			$(document).ready(() => {
				$(".play").on("click", () => {
					$(".spec").toggle();
				}),
				$(".full").on("click", () => {
					$(".qwe").toggle();
				})
			});
		</script>

	</body>
</html>
';

?>