I have a problem adjusting the height of the button. By and large, I do not get a cross browser. With Firefox, it is taller than usual for no reason.
Here is a screenshot (Firefox, Safari and Opera, in that order):

And here is the code: http://jsfiddle.net/TMUnS/2/
I also tried to add some specific ads that I found on the Internet, but in fact they slightly reduced the height, but still they do not match (in the same order):

And here is the code: http://jsfiddle.net/TMUnS/4/ .
How can i fix this?
source share