JSFiddle - React, Tailwind, and code Playground

HTML

<div id="main_menu">
    <div class="menu-left-container">
        <ul id="menu-left" class="menu">
            <li id="menu-item-266" class="menu-item menu-item-type-custom menu-item-object-custom current-menu-item current_page_item menu-item-home menu-item-266"><a href="http://localhost/">Главная</a></li>
            <li id="menu-item-267" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-267"><a href="http://localhost/o-nas.html">О нас</a></li>
            <li id="menu-item-271" class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-271"><a href="http://localhost/category/nashi-raboty">Наши работы</a>
            <ul class="sub-menu">
                <li id="menu-item-276" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-276"><a href="http://localhost/nashi-raboty/vanna.html">ванна</a>
                </li>
                <li id="menu-item-277" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-277"><a href="http://localhost/nashi-raboty/prixozhaya.html">прихожая< /a></li>
                <li id="menu-item-278" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-278"><a href="http://localhost/nashi-raboty/garderobnaya.html">гардеробная< /a></li>
                <li id="menu-item-279" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-279"><a href="http://localhost/nashi-raboty/gostinaya.html">гостиная< /a></li>
                <li id="menu-item-280" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-280"><a href="http://localhost/nashi-raboty/detskaya.html">детская< /a></li>
                <li id="menu-item-281" class="menu-item menu-item-type-post_type menu-item-object-page menu-item-281"><a href="http://localhost/nashi-raboty/kuxnya.html">кухня</ a></li>
            </ul>
            </li>
            <li id="menu-item-268" class="menu-item menu-item-type-post_type menu-item-object-page...