index.html

<html>
    <head>
        <title>Tetris</title>
        <link href="https://fonts.googleapis.com/css?family=Russo+One&display=swap" rel="stylesheet">
        <style>
        .parent {
            display: flex;
            justify-content: center;
            align-items: center;
          }
        #score {
            font-size:2em
        }
        #tetris {
            height: 90vh;
            max-height: 900px
        }
        
        </style>
        
    </head>
    <body class="parent" style="background: #202025; font-family: 'Russo One', sans-serif;" >
        <div  style="color:white; background: #111; padding: 1em; border-radius: 5px">
            <canvas id="tetris" width="480" height="900" style="border-radius: 5px"></canvas>
            <script src="tetris.js"></script>
        </div>
    </body>
</html>