simonGame.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Simon Game</title>
    <link rel="stylesheet" href="simonGame.css">
</head>
<body>
    <h1>Simon Game</h1>
    <h2>Press any key to start game</h2>

    <div  class="btn-container">
        <div class="line-one ">
            <div class="btn yellow " type="button" id="yellow">1</div>
            <div class="btn red " type="button" id="red"> 2 </div>                                                           
              
        </div>
        <div class="line-two  ">
            <div class="btn green " type="button" id="green">3</div>
            <div class="btn purple " type="button" id="purple">4</div>
        </div>
       
       
    </div>
</body>
<script src="simonGame.js"></script>
</html>