JSFiddle - React, Tailwind, and code Playground

HTML

<div class="md-modal md-effect-1" id="modal-1">
	<div class="md-content">
		<h3>Modal Dialog</h3>
		<div>
			<p>This is some test div.</p>
            <button class="md-close">Close me!</button>
		</div>
	</div>
</div>

<a href="#" id="mylink">Hover to show custom div</a>

<div class="md-overlay"></div>

CSS

.md-modal {
  background-color: white;
  color: black;
  padding: 10px;
	position: fixed;
	top: 50%;
	left: 50%;
	width: 50%;
	max-width: 630px;
	min-width: 320px;
	height: auto;
	z-index: 2000;
	visibility: hidden;
	backface-visibility: hidden;
	transform: translateX(-50%) translateY(-50%);
}

.md-show {
	visibility: visible;
}

.md-overlay {
	position: fixed;
	width: 100%;
	height: 100%;
	visibility: hidden;
	top: 0;
	left: 0;
	z-index: 1000;
	opacity: 0;
	background: rgba(0,0,0,0.8);
	transition: all 0.3s;
}

.md-show ~ .md-overlay {
	opacity: 1;
	visibility: visible;
}

JavaScript

$("#mylink").hover(function() {
		$(".md-modal").addClass('md-show');
	});

	$(".md-close").click(function(){
        $(".md-modal").removeClass('md-show');
	});