JSFiddle - React, Tailwind, and code Playground

HTML

<div id="main">
    <div>TITLE</div>
    <div>BODY</div>
    <div>COMMENT</div>
    <div><textarea></textarea></div>
    <div id="overlay">@@@@@@</div>
</div>
<button>overlay</button>

CSS

#main {
    width: 200px;
    height: 200px;
    background-color: yellow;
    position:relative
}
#overlay{
    background:rgba(0, 84, 214, 0.5);
    height:100%; width:100%;
    line-height:200px;
    position:absolute;
    top:0; left:0;
    display:none;
    text-align: center;
}

JavaScript

$('button').click(function(){
    $('#overlay').toggle();
});