Untitled

<html>
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		.container {
			margin: 100px auto;
			width: 600px;
			display: flex;
			flex-direction: row;
			justify-content: space-evenly;
			align-items: center;
			position: relative;
		}

		.elem1, .elem2 {
			background: #ccc;
			width: 110px;
			height: 110px;
			border: 1px solid #000;
			position: relative;
		}

		.elem1::before, .elem2::before {
			content: "";
			position: absolute;
			top: 0;
			left: 0;
			bottom: 0;
			right: 0;
			z-index: -2;
			transition: box-shadow 1s;
			box-shadow: 0px 0px 50px 10px #0f0;
		}

		.elem1:hover::before, .elem2:hover::before {
			z-index: -1;
			box-shadow: 0px 0px 100px 20px #f00;
		}

		.elem2 {
			transition: transform 0.5s;
		}

		.elem2:hover {
			transform: scale(1.5);
		}
	</style>
</head>
<body>

	<div class="container">
		<div class="elem1"></div>
		<div class="elem1"></div>
		<div class="elem1"></div>
		<div class="elem1"></div>
		<div class="elem1"></div>
	</div>

	<div class="container">
		<div class="elem2"></div>
		<div class="elem2"></div>
		<div class="elem2"></div>
		<div class="elem2"></div>
		<div class="elem2"></div>
	</div>

</body>
</html>