Admin toolbar doesn't appear My admin toolbar doesn't showing up. $page_top in html.tpl.php doesn't have any value.

Why doesn't $page_top have any value? How do I fix this?
Try this CSS.

#admin-menu, #admin-menu .dropdown {
  z-index: 9999;
}

.logged-in #oa-navbar {
  top: 25px;
}