WodrPress 404.php page design

[skravchuk]

Hi guys! Help me please with designing 404.php for my wordpress site. I have a problem with php, I didn't know it well

 

Heres what I got.

 

My php code what i find 404.php

 

PHP Code:

<?php get_header(); ?>
<div id="page">
    <h1>Page Not Found</h1>
    <p>I'm very sorry, but the page you requested has not been found! It may have been moved or deleted.</p>
    <p>I'm not blaming you, but have you checked your address bar? There might be a typo in the URL.</p>
    <p>If there isn't, you could try searching my website for the content you were looking for:</p>
    <?php get_search_form(); ?>
    <p>Or maybe you were looking for one of my popular posts:</p>
    <ul>
        <li><a href="http://www.kravchukdesign.com/popular-post1">Popular Post 1</a></li>
        <li><a href="http://www.kravchukdesign.com/popular-post2">Popular Post 2</a></li>
        <li><a href="http://www.kravchukdesign.com/popular-post3">Popular Post 3</a></li>
        <li><a href="http://www.kravchukdesign.com/popular-post4">Popular Post 4</a></li>
    </ul>
    <p>Alternatively, you can go to <a href="http://www.kravchukdesign.com">my home page</a> or <a href="http://www.kravchukdesign.com/archives">browse my archives</a></p>
    <p>One last thing, if you're feeling so kind, please <a href="mailto:info@kravchukdesign.com">tell me</a> about this error, so that I can fix it. Thanks!</p>
</div>
<?php get_sidebar(); get_footer(); ?>

Please help me with it, because it doesn't work well. Here error page. As you see, it doest work well for my site, it's hiden.http://www.kravchukdesign.com/dsegds/

 

Can you please correct my code for my site

Thank you.