Wordpress: Insert Admin Menu Separator and Style Seperators

functions.php

// Register Admin Menu Seperators
function m13_add_admin_menu_separator( $position ) {
    global $menu;
    $menu[ $position ] = array(
        0   =>  '',
        1   =>  'read',
        2   =>  'separator' . $position,
        3   =>  '',
        4   =>  'wp-menu-separator'
    );
}
add_action( 'admin_init', 'm13_add_admin_menu_separator' );

// Insert Admin Menu Seperator
function m13_set_admin_menu_separator() {
    // Make sure this number is different from a CPT menu_postion
    // or else that CPT will be removed from the menu
    do_action( 'admin_init', 26 ); // Insert after Comments
}
add_action( 'admin_menu', 'm13_set_admin_menu_separator' );

// Style the Admin Menu Seperators
function m13_style_admin_menu_separators() {
    echo '<style type="text/css">#adminmenu li.wp-menu-separator {height: 2px; margin: 10px 0; background: rgba(255,255,255,0.15);}</style>';
}
add_action( 'admin_head', 'm13_style_admin_menu_separators' );