jQuery class selector doesn't work and id selector works only with “body”

Question

I\'m trying to apply CSS values with jquery but class selector or id selector does not not work for some reason.

Here is my fiddle:

As you can see nothing happen

Answer 1

 $("kitten").css("background-position", x + "px 0");

this line is wrong..

this one will do the trick

 $("#kitten").css("background-position", x + "px 0");

you need to put the right string literals for ID selectors check it right here.