table {
	width: 750px;
	height: 50px;
	margin-left: auto;
	margin-right: auto;
/*	border-width: 1px;
	border-style: solid;
	border-color: black;
	border-spacing: 0px;*/
	border-spacing: 0px;
}

th {
	color: yellow;
	background-color: blue;
	padding: 10px;
	border-width: 2px;
	border-style: solid;
	border-color: yellow;
	border-spacing: 0px;
	text-align: center;
}

td {
	border-width: 4px;
	border-color: red;
	padding: 10px;
	border-width: 2px;
	border-style: solid;
	border-color: black;
	border-spacing: 0px;
	text-align: center;
}

.a {
	background-color: lightblue;
}

.b {
	background-color: cyan;
}

tr:hover {
	background: white;
	background-color: red;
}