+=speed;
       speed+=0.0002;
         item.style.top=item.y + "px";
    });
  }
 
    function keydown(e){
   keys[e.key]=true;
   move.play();
    }
    function keyup(e){
   keys[e.key]=false;
   move.pause();
    }
    function iscollide(a,b)
    {
    // below code is to get all 4 position of car
        acar=a.getBoundingClientRect();
        bcar=b.getBoundingClientRect();
        return !((acar.top>=bcar.bottom)|| (acar.left>=bcar.right) || (acar.right<=bcar.left)||(acar.bottom<=