Remove 28px margin from admin bar

/*
* WordPress Coding By Khalequzzaman
*/
function
remove_adminbar_margin() {
$remove_adminbar_margin =
'<style type="text/css">
html { margin-top: -28px !
important; }
* html body { margin-top:
-28px !important; }
</style>';
echo $remove_adminbar_margin;
}
/* wp-admin area */
if ( is_admin() ) {
remove_action( 'init',
'_wp_admin_bar_init' );
add_action('admin_head',
'remove_adminbar_margin');
}
/* websites */
if (!is_admin() ) {
remove_action('init',
'_wp_admin_bar_init' );
add_action('wp_head',
'remove_adminbar_margin');
}