Layout Problem inner page

i try https://wordpress.org/support/topic/product-page-problems-aligns-to-the-left this step.

i tryed add code

<div id="page-wrap" class="container">
<div id="content" class="sixteen columns">
<article class=" page type-page status-publish hentry">
<div class="entry">

in header.php to theme files, after the

<?php wp_nav_menu(array('theme_location' => 'main_menu', 'menu_class' => 'menu', 'depth' => '3')); ?>
                    <div class="clear"></div>
                </nav>
                <div class="clear"></div>
            </div>

and

i tryed add code

</div>
</article>
</div>
</div>

in footer.php to theme files, after the

</div><!-- .footer_right -->
        <div class="clear"></div>
    </div>