jules0x

<?php

class CustomMenuItemExtension extends LeftAndMainExtension {

    public function init() {
        // unique identifier for this item. Will have an ID of Menu-$ID
        $id = 'LinkToGoogle';

        // your 'nice' title
        $title = 'Google';

jules0x

Add custom CSS to the CMS

LeftAndMain:
  extra_requirements_css:
    - app/code/css/custom.css

jules0x

CMSMenu::remove_menu_class(MenuAdmin::class);