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HTML

              
                <html lang="en">
<head>
	<meta charset="UTF-8">
	<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css" rel="stylesheet" integrity="sha384-T8Gy5hrqNKT+hzMclPo118YTQO6cYprQmhrYwIiQ/3axmI1hQomh7Ud2hPOy8SP1" crossorigin="anonymous">
	<title>Tic Tac Toe</title>
</head>
<body>
	<div class="board">
		<div class="message-block"> </div>
		<div class="cells">
			<div class="cell c-0-0 d1 h0 v0"></div>
			<div class="cell c-0-1 h0 v1"></div>
			<div class="cell c-0-2 d2 h0 v2"></div>
			<div class="cell c-1-0 h1 v0"></div>
			<div class="cell c-1-1 d1 d2 h1 v1"></div>
			<div class="cell c-1-2 h1 v2"></div>
			<div class="cell c-2-0 d2 h2 v0"></div>
			<div class="cell c-2-1 h2 v1"></div>
			<div class="cell c-2-2 d1 h2 v2"></div>
		</div>
		<div class="modal-block">
			<div class="choice choice-x"></div>
			<p>or</p>
			<div class="choice choice-o"></div>
			<p>?</p>
		</div>
	</div>
</body>
</html>
              
            
!

CSS

              
                html, body, * {
	padding: 0;
	margin: 0;
}
body {
	color: #333;
	background: #eee;
}

.board {
	position: relative;
	padding-bottom: 42px;
	margin: 0 auto;
	margin-top: 100px;
	width: 235px;
	height: 235px;
	font-size: 0;
	background: #555;
}
.cells {
	margin-bottom: 20px;
}
.cell {
	position: relative;
	display: inline-block;
	margin-right: 5px;
	margin-bottom: 5px;
	width: 75px;
	height: 75px;
	border-radius: 5px;
	background: #eee;
	cursor: default;
}
.cell:nth-child(3n) {
	margin-right: 0;
}
.c-0-0 {
	border-radius: 15px 5px 5px 5px;
}
.c-0-2 {
	border-radius: 5px 15px 5px 5px;
}
.c-2-0 {
	border-radius: 5px 5px 5px 15px;
}
.c-2-2 {
	border-radius: 5px 5px 15px 5px;
}
.x:after,
.o:after {
	position: absolute;
	display: block;
	width: 75px;
	height: 75px;
	font-family: "FontAwesome";
	font-size: 78px;
	line-height: 70px;
	text-align: center;
	color: #555;
	text-shadow: 0px 0px 3px rgba(0, 0, 0, 0.5);
	cursor: default;
}
.x:after {
	content: "\f00d";
}
.o:after {
	content: "\f10c";
	font-size: 66px;
	line-height: 75px;
}
.highlighted:after {
	text-shadow: 0px 0px 10px rgba(255, 0, 0, 0.9);
}

.message-block {
	margin: 0 auto;
	padding-bottom: 10px;
	width: 235px;
	font-size: 28px;
	line-height: 32px;
	text-align: center;
	font-weight: 800;
	color: #555;
	text-shadow: 3px 3px 3px rgba(0, 0, 0, 0.25);
	background: #eee;
}

.modal-block {
	position: absolute;
	top: 300px;
	left: 50%;
	margin-left: -148px;
	padding: 20px;
	width: 250px;
	height: 76px;
	font-size: 0;
	text-align: center;
	border-radius: 10px;
	border: 3px solid #666;
	background: #e1e1e1;
}
.modal-block p {
	position: relative;
	top: 12px;
	display: inline-block;
	font-family: "Tahoma";
	font-size: 36px;
	line-height: 20px;
}
.choice {
	position: relative;
	display: inline-block;
	margin-left: 12px;
	margin-right: 12px;
	width: 75px;
	height: 79px;
	vertical-align: middle;
	cursor: pointer;
}
.choice-x:after,
.choice-o:after {
	display: inline-block;
	width: 75px;
	height: 75px;
	font-family: "FontAwesome";
	font-size: 80px;
	line-height: 72px;
	color: #fff;
	text-shadow: 0px 0px 12px rgba(0, 0, 0, 1);
}
.choice-x:after {
	content: "\f00d";
}
.choice-o:after {
	content: "\f10c";
	font-size: 66px;
	line-height: 78px;
}
              
            
!

JS

              
                $(document).ready(function() {
	var board = [ [0, 0, 0], [0, 0, 0], [0, 0, 0] ];
	var ai = 1;
	var player = 2;

	centerBoard();
	$(window).resize(function() {
		centerBoard();
	});

	$('.choice-x').click(function() {
		makeChoice('x');
		startGame();
	});

	$('.choice-o').click(function() {
		makeChoice('o');
		startGame();
	});

	function clickCell() {
		if ($(this).hasClass('x') || $(this).hasClass('o')) {
			return;
		}

		$(this).addClass( player == 1 ? 'x' : 'o' );

		board[Math.floor($('.cell').index($(this)) / 3)][$('.cell').index($(this)) % 3] = player;

		if (getNodeValue(board, true)) {
			finishGame('Player wins');
			return;
		} else if (!generateChildNodes(board, true).length) {
			finishGame('Draw');
			return;
		}

		makeAiTurn();

		if (getNodeValue(board, false)) {
			finishGame('AI wins');
			return;
		} else if (!generateChildNodes(board, false).length) {
			finishGame('Draw');
			return;
		}
	}

	function startGame() {
		if (ai == 1) {
			board[Math.floor(Math.random() * 3)][Math.floor(Math.random() * 3)] = ai;
			refreshBoard(board);
		}
	}

	function finishGame(str) {
		$('.message-block').text(str);
		$('.modal-block').fadeIn(300);
		$('.cell').off('click', clickCell)
							.css('cursor', 'default');
		if (str !== 'Draw') {
			highlight(board);
		}
	}

	function makeAiTurn() {
		var possibleTurns = generateChildNodes(board, false);
		var bestTurns = [];
		var turnValues = [];

		possibleTurns.forEach(function(item) {
			turnValues.push( minimax(item, 5, true) );
		});

		var bestValue = Math.min.apply(null, turnValues);

		for (var i = 0; i < possibleTurns.length; i++) {
			if (turnValues[i] == bestValue) {
				bestTurns.push( possibleTurns[i] );
			}
		}

		board = bestTurns[Math.floor(Math.random() * bestTurns.length)];

		refreshBoard(board);
	}

	function minimax(node, depth, maxPlayer) {
		var childNodes = generateChildNodes(node, maxPlayer);
		var nodeValue = getNodeValue(node);

		if (!depth || nodeValue || !childNodes.length) {
			return nodeValue - depth;
		}

		if (maxPlayer) {
			var bestVal = -9000;

			childNodes.forEach(function(item) {
				var nVal = minimax(item, depth - 1, false);
				bestVal = Math.max(bestVal, nVal);
			});

			return bestVal;
		} else {
			var bestVal = 9000;

			childNodes.forEach(function(item) {
				var nVal = minimax(item, depth - 1, true);
				bestVal = Math.min(bestVal, nVal);
			});

			return bestVal;
		}
	}

	// high == true is used to find win combo for highlighting
	function getNodeValue(node, high) {
		//diagonal check
		if (node[0][0] == ai && node[0][0] == node[1][1] && node[0][0] == node[2][2]) {
			return high ? '.d1' : -10;
		} else if (node[0][0] == player && node[0][0] == node[1][1] && node[0][0] == node[2][2]) {
			return high ? '.d1' : 10;
		}

		if (node[0][2] == ai && node[0][2] == node[1][1] && node[0][2] == node[2][0]) {
			return high ? '.d2' : -10;
		} else if (node[0][2] == player && node[0][2] == node[1][1] && node[0][2] == node[2][0]) {
			return high ? '.d2' : 10;
		}
		//horizontal & vertical check
		for (var i = 0; i < node.length; i++) {
			if (node[i][0] == ai && node[i][0] == node[i][1] && node[i][0] == node[i][2]) {
				return high ? '.h' + i : -10;
			} else if (node[i][0] == player && node[i][0] == node[i][1] && node[i][0] == node[i][2]) {
				return high ? '.h' + i : 10;
			}

			if (node[0][i] == ai && node[0][i] == node[1][i] && node[0][i] == node[2][i]) {
				return high ? '.v' + i : -10;
			} else if (node[0][i] == player && node[0][i] == node[1][i] && node[0][i] == node[2][i]) {
				return high ? '.v' + i : 10;
			}
		}

		return 0;
	}

	function generateChildNodes(node, maxPlayer) {
		var childNodes = [];

		for (var i = 0; i < node.length; i++) {
			for (var j = 0; j < node[i].length; j++) {
				if (node[i][j] === 0) {
					node[i][j] = maxPlayer ? player : ai;
					//JSON used to clone nested arrays
					childNodes.push( JSON.parse(JSON.stringify(node)) );
					node[i][j] = 0;
				}
			}
		}

		return childNodes;
	}

	function highlight(node) {
		$(getNodeValue(node, true)).addClass('highlighted');
	}

	function refreshBoard(node) {
		var flatNode = [].concat.apply([], node);

		$('.cell').each(function(index) {
			if (flatNode[index] == 1 && !$(this).hasClass('x')) {
				$(this).addClass('x');
			} else if (flatNode[index] == 2 && !$(this).hasClass('o')) {
				$(this).addClass('o');
			}
		});
	}

	function clearBoard() {
		$('.cell').each(function(index) {
			$(this).removeClass('x o highlighted');
		});
	}

	function makeChoice(choice) {
		board = [ [0, 0, 0], [0, 0, 0], [0, 0, 0] ];
		clearBoard();

		if (choice == 'x') {
			player = 1;
			ai = 2;
		} else if (choice == 'o') {
			player = 2;
			ai = 1;
		}

		$('.modal-block').fadeOut(300);
		$('.message-block').text(' ');
		$('.cell').click(clickCell)
							.css('cursor', 'pointer');
	}

	function centerBoard() {
		$('.board').css('marginTop', ($(window).innerHeight() - $('.board').height()) / 8);
	}
});
              
            
!
999px

Console