丸の中にアイコン

<span class="iconWrap">
	<span class="icon-tel"></span>
</span>

span.iconWrap {
	font-size: 1.25em;
	display: inline-block;
	border-radius: 50%;
	color: #fff;
	background: #000;
	text-decoration: none;
	width: 2em;
	height: 2em;
	text-align: center;
	line-height: 1;
	[class^="icon-"] {
		margin: 0;
		padding: 0;
		line-height: 2;
		vertical-align: middle;
	}
}