body {
	text-align: center;
}

table {
	border-collapse: collapse;
	margin: auto;
}

td {
	width: 50px;
	height: 50px;
	font-size: 20px;
	vertical-align: middle;
	text-align: center;
	cursor: pointer;
	border-left: 1px solid gray;
	border-top: 1px solid gray;
}

tr:first-child td {
	border-top: none;
}

td:first-child {
	border-left: none;
}