hook content to site-content:after

Hi,

I would like to hook content right after the site-content markup.

I tried this on my child functions but since it is inside the two-columns lay-out it is not suiting my need to have a new “no 2 column section”.

/* test */
function my_added_content ( $content ) {
    if ( is_page() ) {
        return $content . '<p>Content here</p>';
    }
}
add_filter( 'the_content', 'my_added_content');

It works but how Can I place it out, after the site-content?

Thanks.

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