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HTML

              
                 <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <title>Color Game</title>

        <link rel="stylesheet" type="text/css" href="colorguess.css">
    </head>
    <body>
    <h1>The Amazing 
        <br>
        <span id = "colorDisplay">RGB</span>
        <br>
         Color Game
    </h1>
    <div id = "stripe">
        <button id = "reset">New Colors</button>
        <span id ="message"></span>
        <button id = "easyBtn">Easy</button>
        <button id = "hardBtn" 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="colorguess.js" async defer></script>
    </body>
              
            
!

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

#colorDisplay {
	font-size: 200%;
}

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

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

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

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: steelblue;
}
              
            
!

JS

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

init();

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

function setupModeButtons(){
    for(let 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 (let i = 0; i < squares.length; i++){

        //add click listeners to squares
        squares[i].addEventListener("click", function(){
            //grab color of clicked square
            let 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);
    //pick a new random color from array
    pickedColor = pickColor();
    //change colorDisplay to match pickedColor
    colorDisplay.textContent = pickedColor;
    resetButton.textContent = "New Colors"
    messageDisplay.textContent = "";
    //change colors of squares
    for(let 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 thru all squares
    for(let i = 0; i < squares.length; i++){
    //change each color to match given color
    squares[i].style.backgroundColor = color;
    }
    
}

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

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

function randomColor(){
    //pick a "red" from 0 to 255
    let r = Math.floor(Math.random() * 256)
    //pick a "green" from 0 to 255
    let g = Math.floor(Math.random() * 256)
    //pick a "blue" from 0 to 255
    let b = Math.floor(Math.random() * 256)
    return "rgb(" + r + ", " + g + ", " + b + ")";
}
              
            
!
999px

Console