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/* Method 1 */

.a {
	width: 200px;
	height: 200px;
	background-color: black;
	color: #fff;
	display:flex;
	justify-content:center;
	flex-direction:column;
}


/* Method 2  (Working in all browsers )*/

.a {
	height: 150px;
	width: 240px;
	background-color: black;
	color:white;
	display:table;
}

.a p {
	display:table-cell;
	vertical-align: middle;
}


/* Method 3 */

outer {
	width: 200px;
	height: 200px;
	background-color: black;
	color:white;
	position: relative;
}

.inner {
	height: 50px;
	width: 50px;
	background-color: red;
	position: absolute;
	top: 50%;
	transform:translateY(-50%);
}