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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

              
                <canvas id="gameCanvas" width="800" height="600" ></canvas>
              
            
!

CSS

              
                    html, body {
        margin: 0;
        background-color: #a3ebbc;
    }
    
    #gameCanvas {
        display:block; 
        margin: 20px auto;
    }
              
            
!

JS

              
                var canvas;
var canvasContext;
var ballX = 50;
var ballY = 50;
var ballSpeedX = 10;
var ballSpeedY = 4;
    
var player1Score = 0;
var player2Score = 0;
const WINNING_SCORE = 3;

var showingWinScreen = false;
    
var paddle1Y = 250;
var paddle2Y = 250;
const PADDLE_THICKNESS = 10;
const PADDLE_HEIGHT = 100;
    
function calculateMousePos(evt){
    var rect = canvas.getBoundingClientRect();
    var root = document.documentElement;
    var mouseX = evt.clientX - rect.left - root.scrollLeft;
    var mouseY = evt.clientY - rect.top - root.scrollTop;
    return {
        x:mouseX,
        y:mouseY
    };
}
    
    
function handleMouseClick(evt) {
    if(showingWinScreen){
        player1Score = 0;
        player2Score = 0;
        showingWinScreen = false;
    }
}
    
window.onload = function () {
    canvas = document.getElementById('gameCanvas');
    canvasContext = canvas.getContext('2d');
    drawEverything();
    
    var framesPerSecond = 30;
    setInterval(function(){
        moveEverything();
        drawEverything();
    },1000/framesPerSecond);
    
    canvas.addEventListener('mousedown',handleMouseClick);
    
    canvas.addEventListener('mousemove',
                       function(evt) {
    var mousePos = calculateMousePos(evt);
    paddle1Y = mousePos.y-(PADDLE_HEIGHT/2);
})
}

function ballReset(){
    if (player1Score >= WINNING_SCORE ||
        player2Score >= WINNING_SCORE) {
            showingWinScreen = true;
    }
    
    ballSpeedX = -ballSpeedX;
    ballX = canvas.width/2;
    ballY = canvas.height/2;
}


function computerMovement(){
    var paddle2YCenter = paddle2Y + (PADDLE_HEIGHT/2);
    if(paddle2YCenter < ballY-35){
        paddle2Y += 6;
    } else if (paddle2YCenter > ballY-35) {
        paddle2Y -= 6;
    }
}
    console.log (paddle2Y);
    
    
function moveEverything () {    
    if(showingWinScreen){
        return;
    }
    
    computerMovement();
    
    ballX += ballSpeedX;
    ballY += ballSpeedY;
    
    if(ballX > canvas.width) {
        // ballSpeedX = -ballSpeedX;
        if(ballY > paddle2Y && ballY < paddle2Y+PADDLE_HEIGHT) {
            ballSpeedX = -ballSpeedX;
            
            var deltaY = ballY -(paddle2Y+PADDLE_HEIGHT/2);
            ballSpeedY = deltaY * 0.35;
            
            
        } else {
            player1Score++; //must be before ballreset
            ballReset();
        }
    }
    
    if(ballX < 0) {
        // ballSpeedX = -ballSpeedX;
        if(ballY > paddle1Y && ballY < paddle1Y+PADDLE_HEIGHT) {
            ballSpeedX = -ballSpeedX;
            
            var deltaY = ballY -(paddle1Y+PADDLE_HEIGHT/2);
            ballSpeedY = deltaY * 0.35;
            
            
        } else {
            player2Score++;
            ballReset();
            
        }
    }
    
    if(ballY > canvas.height) {
        ballSpeedY = -ballSpeedY;
    }
    
    if(ballY < 0) {
        ballSpeedY = -ballSpeedY;
    }
}

function drawNet() {
    for(var i=0; i<canvas.height; i+=40) {
        colorRect(canvas.width/2-1,i,2,20,'black');
    }
}
    
function drawEverything(){
    // draws the game field
    colorRect(0,0,canvas.width,canvas.height,'#FFEFB8');
    
    if(showingWinScreen){
        if (player1Score >= WINNING_SCORE){
            canvasContext.fillStyle = '#411103';
            canvasContext.fillText("YOU WIN",canvas.width/2-50,100);
        } else if (player2Score >= WINNING_SCORE) {
            canvasContext.fillStyle = '#411103';
            canvasContext.fillText("PC WINS",canvas.width/2-50,100);
        }
        canvasContext.fillStyle = '#411103';
        canvasContext.fillText("click to continue",canvas.width/2-100,350);
        return;
    }
    
    drawNet();
    
    // left player
    colorRect(0,paddle1Y,PADDLE_THICKNESS,PADDLE_HEIGHT,'#411103');
    
    // right player
    colorRect(canvas.width-PADDLE_THICKNESS,paddle2Y,PADDLE_THICKNESS,PADDLE_HEIGHT,'#411103');
    
    // the ball
    colorCircle(ballX, ballY, 10, '#411103');
    
    canvasContext.font="30px sans-serif";
    canvasContext.fillText(player1Score,200,100);
    canvasContext.fillText(player2Score,canvas.width-200,100);
}
    
function colorCircle(centerX,centerY,radius,drawColor){
    // the ball
    canvasContext.fillStyle = drawColor;
    canvasContext.beginPath();
    canvasContext.arc(centerX,centerY,radius,0,Math.PI*2, true);
    canvasContext.fill();
}
    
function colorRect(leftX,topY, width,height,drawColor){
    canvasContext.fillStyle = drawColor;
    canvasContext.fillRect(leftX,topY, width,height,drawColor);
}
              
            
!
999px

Console