One page theme: pages margin and page order (How to?)

i’m working on a one page theme. Here is the code i use to get all of the pages to display on one page

`<?php $pages = get_pages();
foreach ($pages as $page_data) {
$content = apply_filters(‘the_content’, $page_data->post_content);
$title = $page_data->post_title;
$slug = $page_data->post_name;
echo “<div class=’$slug’>”;
echo “<h2>$title</h2>”;
echo $content;
echo “</div>”;
}
?>
No problem there

Two questions I have are

1)How do i get to display pages in certain order? I tried setting up order in admin panel, but it didn’t work at all

2)How do i set up margins between these pages?

Thank you!