JSFiddle - React, Tailwind, and code Playground

HTML

<div id="button">
    hover me
</div>
<div id="my-menu">
    my menu
</div>

CSS

#my-menu, #button{
    padding: 5px;
    border: 1px solid #000;
}
#my-menu{
    display: none;
}
#button:hover + #my-menu,
#my-menu:hover{
    display: block;
}