JSFiddle - React, Tailwind, and code Playground

HTML

<ul id='menu_fixed'>
    <li id='#submenus'></li>
</ul>

CSS

ul {display: none;}
li{    
    background-color:gray;
}

JavaScript

$('#menu_fixed').hover(
            function () {
                    $('#submenus').css({ display: block }); //mouseover
                },

            function () {
                setTimeOut(function(){ }, 1000); // Disappear after 3000 ms or 3 seconds
            }
			);