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HTML

              
                <main class="container">
	<div class="config">
		<button id="player-sign-btn">Playing as: <span>X</span> <i>(X goes first!)</i></button>
	</div>
	<table class="board">
		<tbody>
			<tr>
				<td class="corner" data-cell="0">&nbsp;</td>
				<td class="side" data-cell="1">&nbsp;</td>
				<td class="corner" data-cell="2">&nbsp;</td>
			</tr>
			<tr>
				<td class="side" data-cell="3">&nbsp;</td>
				<td class="center" data-cell="4">&nbsp;</td>
				<td class="side" data-cell="5">&nbsp;</td>
			</tr>
			<tr>
				<td class="corner" data-cell="6">&nbsp;</td>
				<td class="side" data-cell="7">&nbsp;</td>
				<td class="corner" data-cell="8">&nbsp;</td>
			</tr>
		</tbody>
	</table>
	<div class="config">
		<p>You: <span data-player="player">0</span></p>
		<p>Computer: <span data-player="computer">0</span></p>
	</div>
</main>
<div id="notification">
	<p></p>
</div>
              
            
!

CSS

              
                $board-side: 60vmin;
$yellow: #ffc85d;
$green: #57dd51;
$purple: #994ec3;
$sign-size: ($board-side / 4)/1.25;
@mixin text-selectability($none) {
	-webkit-user-select: $none;
	-moz-user-select: $none;
	-ms-user-select: $none;
	user-select: $none;
}

* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}

html,
body {
	height: 100%;
}

body {
	display: flex;
	align-items: center;
	justify-content: center;
	background: linear-gradient(white, $yellow);
	@include text-selectability(none);
}

.container {
	display: flex;
	align-items: center;
	flex-direction: column;
	max-width: $board-side;
}

.config {
	display: flex;
	justify-content: space-around;
	margin: auto auto 1vmin;
	width: $board-side;
	button {
		background-color: white;
		font: 2vmin "Titillium Web", sans-serif;
		border: 0 solid transparent;
		background-color: $yellow;
		border-radius: 25%;
		padding: 5px;
		cursor: pointer;
		outline: .1vmin solid transparent;
		&:disabled {
			cursor: not-allowed;
			background-color: lightgray;
		}
		&:not(:active) {
			animation: {
				name: fadeIn;
				duration: 800ms;
			}
		}
		&:hover {
			background-color: white;
		}
		span {
			font-size: 3vmin;
		}
	}
	#player-sign-btn {
		background-color: $purple;
		font-weight: bolder;
		&:disabled {
			background-color: lightgray;
		}
	}
	p {
		font: bold 3vmin "Titillium Web", sans-serif;
		display: inline-block;
		margin-top: 1vmin;
		span {
			font-size: 4vmin;
		}
	}
}

.board {
	border-radius: 2%;
	position: relative;
	border: .5vmin solid black;
	height: $board-side;
	width: $board-side;
	background-color: white;
	td {
		border-radius: 3%;
		border: .5vmin solid lightgray;
		font: bold $sign-size "Droid Sans Mono", monospace;
		text-align: center;
		cursor: pointer;
		&:active {
			opacity: 0;
		}
		&:not(:active) {
			animation: {
				name: fadeIn, fontEnlarge;
				duration: 600ms, 300ms;
				timing-function: cubic-bezier(0, .5, .25, 1);
			}
		}
		&:hover {
			border-color: black;
		}
	}
}

#notification {
	display: flex;
	position: fixed;
	left: 0;
	top: 0;
	width: 100%;
	height: 100%;
	margin: auto;
	font: bold $board-side / 10 "Titillium Web", sans-serif;
	z-index: -1;
	p {
		margin: auto;
		background-color: rgba(255, 255, 255, .85);
		padding: 1vmin;
		border-radius: 3%;
	}
}

@keyframes fadeIn {
	from {
		opacity: 0;
	}
	to {
		opacity: 1;
	}
}

@keyframes fontEnlarge {
	from {
		font-size: .1vmin;
	}
	to {
		font-size: $sign-size;
	}
}
              
            
!

JS

              
                const winCombos = [
	[0, 1, 2],
	[0, 3, 6],
	[0, 4, 8],
	[1, 4, 7],
	[2, 4, 6],
	[2, 5, 8],
	[3, 4, 5],
	[6, 7, 8]
];

let isPlayerO = false;
let spotsTaken = 0;
let xPlayerMoves = [];
let oPlayerMoves = [];
let computerScore = 0;
let playerScore = 0;

function chooseSpot(arrCellsToChooseFrom) {
	let randomCell = arrCellsToChooseFrom[Math.floor(Math.random() * arrCellsToChooseFrom.length)];

	if ($(randomCell).prop("hasSign") === true) { // If cell is already taken, choose another cell.
		while ($(randomCell).prop("hasSign") === true) {
			randomCell = arrCellsToChooseFrom[Math.floor(Math.random() * arrCellsToChooseFrom.length)];
		}
	}

	return randomCell;
}

function addToScore(player) { // Call when a player wins.
	if (player === "computer") {
		computerScore++;
		$("[data-player='computer']").text(computerScore);
	} else {
		playerScore++;
		$("[data-player='player']").text(playerScore);
	}
}

function isWinCombo(array, player) {
	if (spotsTaken < 5) return;

	array.sort();

	for (let i = 0; i < winCombos.length; i++) {
		let matches = 0;
		for (let j = 0; j < winCombos[i].length; j++) {
			if (array.includes(winCombos[i][j])) {
				matches++;
			}
			if (matches === 3) {
				showVictory(player);
				return true;
			}
		}
	}
	return false;
}

/* This function should take an arbitrary cell and "player" if it is the player's turn. 
    The cell parameter can also take a random cell, or a semi-random cell if !isEasy. */
function drawPlayerSign(cell, player) {
	let cellIndex = $(cell).data("cell");

	function takeSpot(sign) {
		sign === "O" ?
			$(cell).css("background-color", "#57dd51") :
			$(cell).css("background-color", "#994ec3");

		$(cell).text(sign);
		$(cell).prop("hasSign", true);
		spotsTaken++;
	}

	if (player === "computer") {
		if (isPlayerO) {
			takeSpot("X");
			xPlayerMoves.push(cellIndex);
			// console.log("Computer moves: ", xPlayerMoves);
		} else {
			if (spotsTaken === 0) return;
			takeSpot("O");
			oPlayerMoves.push(cellIndex);
			// console.log("Computer moves: ", oPlayerMoves);
		}
	} else {
		if (isPlayerO) {
			takeSpot("O")
			oPlayerMoves.push(cellIndex);
			// console.log("Player moves: ", oPlayerMoves);
		} else {
			takeSpot("X");
			xPlayerMoves.push(cellIndex);
			// console.log("Player moves: ", xPlayerMoves);
		}
	}

	return cellIndex;
}

function showVictory(player) {
	$("#notification p").text(`${player.toUpperCase()} has won!`);
	addToScore(player);
	$("#notification").css("z-index", "2");
	spotsTaken = 0;
	return setTimeout(() => {
		clearBoard();
	}, 1000);
}

function $toggleButton(button, boolean) {
	return boolean === true ?
		$(button).prop("disabled", true) :
		$(button).prop("disabled", false);
}

const clearBoard = () => { // To be called when spotsTaken === 9.
	for (let cellIndex = 0; cellIndex < $("td").length; cellIndex++) {
		$($("td")[cellIndex]).css("background", "white");
		$($("td")[cellIndex]).prop("hasSign", false);
		$($("td")[cellIndex]).html("&nbsp;");
		spotsTaken = 0;
	}
	xPlayerMoves = [];
	oPlayerMoves = [];

	$("#notification").css("z-index", "-1");

	if (isPlayerO) {
		setTimeout(() => {
			drawPlayerSign(chooseSpot($(".corner")), "computer");
		}, 250);
	}
}

const takeTurn = cell => {
	const $thisCell = $(cell.target);

	if (isPlayerO && spotsTaken === 0) return;

	if (isPlayerO) {
		drawPlayerSign($thisCell, "player");
		isWinCombo(oPlayerMoves, "player");
		if (isWinCombo(oPlayerMoves, "player")) return;

		if (spotsTaken !== 0) {
			setTimeout(() => {
				drawPlayerSign(chooseSpot($("td")), "computer");
				isWinCombo(xPlayerMoves, "computer");
				if (isWinCombo(xPlayerMoves, "computer")) return;
				else if (spotsTaken === 9) {
					$("#notification p").text("Draw!");
					$("#notification").css("z-index", "2");
					return setTimeout(clearBoard, 750);
				}
			}, 200);
		}
	} else {
		drawPlayerSign($thisCell, "player");
		isWinCombo(xPlayerMoves, "player");
		if (spotsTaken === 0) return setTimeout(clearBoard, 750);
		if (isWinCombo(xPlayerMoves, "player")) return;

		if (spotsTaken === 9) {
			$("#notification p").text("Draw!");
			$("#notification").css("z-index", "2");
			return setTimeout(clearBoard, 750);
		} else {
			setTimeout(() => {
				drawPlayerSign(chooseSpot($("td")), "computer");
				isWinCombo(oPlayerMoves, "computer");
			}, 200);
			if (isWinCombo(oPlayerMoves, "computer")) return;
		}
	}
};

$(document).ready(() => {
	$toggleButton("#player-sign-btn", false);

	$("#player-sign-btn").on("click", () => {
		const $playerSign = $("#player-sign-btn span");

		if (isPlayerO) {
			isPlayerO = false;
			$("#player-sign-btn").css("background-color", "#994ec3");
			$playerSign.text("X");
		} else {
			isPlayerO = true;
			$("#player-sign-btn").css("background-color", "#57dd51");
			$playerSign.text("O");
		}

		clearBoard();
	});

	$("td").on("click", cell => {
		if ($(cell.target).prop("hasSign") === true) return;

		takeTurn(cell);
	});
});
              
            
!
999px

Console