Rotation Using Accelerometer

I am trying to rotate floor using Input.acceleration. I want to rotate floor around the point where player is standing. I have used the following code(C#)

 Vector3 accelerometerValues = Input.acceleration;
 transform.RotateAround (target.position,Vector3.back, acceleroValueX * speed * Time.deltaTime);
 transform.RotateAround (target.position,Vector3.right, acceleroValueY * speed * Time.deltaTime);

But floor is gradually moving down and floor is also getting rotated around Y axis.