Gagan Goraya

This is a very slim piece of plugin that gives you incredible flexibility to apply your own CSS class(s) to any specific widget.
If this plugin is activated, it will present an additional ‘CSS Class’ field in every widget.
You can input any css class name or even more than one class name by separating each with a space.
If, somehow your widget is not wrapped inside an HTML block element (depends upon the theme you are
using), this plugin will intelligently wrap the widget with a DIV tag and apply to class to it.

Simple CSS for widgets

This plugin lets you specify CSS class(s) for widgets to apply your own CSS definitions to specific widgets.

Ponsiva . Pandian

Menu Item Custom Attributes allows you to add HTML attributes such as <code>id</code>, <code>class</code>, and <code>data-*</code> directly to WordPress menu items from the admin interface.
This plugin is perfect for developers and designers who want fine-grained control over menu elements for styling, tracking, or custom scripting — all without editing theme code.
Key Features 
– Add unique HTML <code>ID</code>, CSS <code>Class</code>, or custom <code>Data</code> attributes to individual menu items 
– Works directly within the native Appearance → Menus screen 
– Compatible with all themes and page builders (Elementor, Astra, Divi, etc.) 
– Lightweight and performance-optimized 
– Safe and secure with sanitization and nonce checks
Use it to apply special styles, attach JavaScript actions, or integrate with analytics tools like Google Tag Manager.
<h3>Support</h3>
For feature requests, issues, or feedback, please visit the <a href="https://wordpress.org/support/plugin/menu-item-custom-attributes/" rel="ugc">Support Forum</a>.
<h3>License</h3>
This plugin is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
<h3>Credits</h3>
Developed and maintained by Ponsiva Pandian 
Website: <a href="www.iamponsiva.rf.gd" rel="nofollow ugc">www.iamponsiva.rf.gd</a>

Menu Item Custom Attributes

Easily add custom ID, Class, and Data attributes to WordPress menu items directly from the admin panel — no coding required.

Simple CSS for widgets vs Menu Item Custom Attributes