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dabblet.css

.ani-box-shadow-2{
	position: relative;
	margin: 50px;
	width: 200px;
	height: 200px;
	background-color: steelblue;
	-webkit-animation: myAnimation 1s infinite alternate;
}

@-webkit-keyframes myAnimation{
	from { box-shadow: 0 0 5px 5px rgba(255,0,0,0.5) }
	to { box-shadow: none }
}

dabblet.html

<div class="ani-box-shadow-2"></div>

settings.json

{"view":"separate","fontsize":"60","seethrough":"","prefixfree":"1","page":"all"}