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HTML

              
                <html>
<head>
	<title>Color Game</title>
	<link rel="stylesheet" type="text/css" href="styles.css">
</head>
<body>

<h1>
	The Great 
	<br>
	<span id="colorDisplay">RGB</span> 
	<br>
	Color Game
</h1>

<div id="stripe"> 
	<button id="reset">New Colors</button>
	<span id="message"></span>
	<button class="mode">Easy</button>
	<button class="mode" class="selected">Hard</button>
</div>

<div id="container">
	<div class="square"></div>
	<div class="square"></div>
	<div class="square"></div>
	<div class="square"></div>
	<div class="square"></div>
	<div class="square"></div>
</div>


<script src="script.js"></script>
</body>
</html>
              
            
!

CSS

              
                body {
	background-color: #232323;
	margin: 0;
	font-family: "Montserrat", "Avenir";
}

.square {
	width: 30%;
	background: purple;
	padding-bottom: 30%;
	float: left;
	margin: 1.66%;
	border-radius: 15%;
	transition: background 0.6s;
	--webkit-transition: background 0.6s;
	--moz-transition: background 0.6s;
}

#container {
	margin: 20px auto;
	max-width: 600px;
}

h1 {
	color: white;
	text-align: center;
	background-color: steelblue;
	margin: 0;
	font-weight: normal;
	text-transform: uppercase;
	line-height: 1.1;
	padding: 20px 0;
}

#stripe {
	background-color: white;
	height: 30px;
	text-align: center;
}

.selected {
	color: white;
	background-color: steelblue;
}

#colorDisplay {
	font-size: 200%;
}

#message {
	display: inline-block;
	width: 20%;
}

button {
	border: none;
	background: none;
	text-transform: uppercase;
	height: 100%;
	font-weight: 700;
	color: steelblue;
	letter-spacing: 1px;
	font-size: inherit;
	transition: all 0.3s;
	--webkit-transition: all 0.3s;
	--moz-transition: all 0.3s;
	outline: none;
}

button:hover {
	color: white;
	background-color: steelblue;
}


              
            
!

JS

              
                var numSquares = 6;
var colors = [];
var pickedColor;
var squares = document.querySelectorAll(".square");
var colorDisplay = document.getElementById("colorDisplay");
var messageDisplay = document.querySelector("#message");
var h1 = document.querySelector("h1");
var resetButton = document.querySelector("#reset");
var modeButtons = document.querySelectorAll(".mode");

init();

function init(){
    setupModeButtons();
    setupSquares();    
    reset();
}

function setupModeButtons(){
    //mode buttons event listeners
    for (var i = 0; i < modeButtons.length; i++){
        modeButtons[i].addEventListener("click", function(){
            modeButtons[0].classList.remove("selected");
            modeButtons[1].classList.remove("selected");
            this.classList.add("selected");
            this.textContent === "Easy" ? numSquares = 3 : numSquares = 6;
            reset();
        });
    }
}

function setupSquares(){
    for(var i = 0; i < squares.length; i++){
        //add click listeners to squares
        squares[i].addEventListener("click", function() {
            //grab color of clicked squares
            var clickedColor = this.style.backgroundColor;
            //compare color to pickedColor
            if(clickedColor === pickedColor) {
                messageDisplay.textContent = "Correct!";
                resetButton.textContent = "Play Again?";
                changeColors(clickedColor);
                h1.style.backgroundColor = clickedColor;
            } else {
                this.style.backgroundColor = "#232323";
                messageDisplay.textContent = "Try Again";
            }
        });
    }
}

function reset(){
    colors = generateRandomColors(numSquares);
    pickedColor = pickColor();
    colorDisplay.textContent = pickedColor;
    resetButton.textContent = "New Colors";
    messageDisplay.textContent = "";
    for(var i = 0; i < squares.length; i++){
        if(colors[i]){
            squares[i].style.display = "block";
            squares[i].style.backgroundColor = colors[i];
        } else {
            squares[i].style.display = "none";
        }
    }
    h1.style.backgroundColor = "steelblue";
}

resetButton.addEventListener("click", function(){
    reset();
});

function changeColors(color) {
	//loop through all squares
	for(var i = 0; i < squares.length; i++) {
		//change each color to match given color
		squares[i].style.backgroundColor = color;
	}
}

function pickColor() {
	var random = Math.floor(Math.random() * colors.length);
	return colors[random];
}

function generateRandomColors(num){
    //make an array
    var arr = [];
    //repeat num times
    for(var i = 0; i < num; i++){
        //get random color and push into array
        arr.push(randomColor());
    }
    //return array
    return arr;
}

function randomColor(){
    //pick a "red" from 0 - 255
    var r = Math.floor(Math.random() * 256);
    //pick a "green" from 0 - 255
    var g = Math.floor(Math.random() * 256);
    //pick a "blue" from 0 - 255
    var b = Math.floor(Math.random() * 256);
    return "rgb(" + r + ", " + g + ", " + b + ")";
}
              
            
!
999px
If a groundhog inspects their Web Component, do they see their Shadow DOM?

Console