JSFiddle - React, Tailwind, and code Playground

HTML

<div style="width:200px;height:200px;background:yellow;position:relative">
    <span class="hover-content">
        <span>+</span>
    </span>
    
</div>

CSS

.hover-content{position:absolute;display:none}
div:hover .hover-content{display:block}