Is the player.css file always the same?

The eLearning modules we are making for our client will be viewed as HTML5 using Internet Explorer. To work around a problem with the Menu and Notes I have been editing the "player.css" file within the published "mobile" folder. I'd like to know if the player.css file is always the same no matter what the content of the Storyline module is, or is it different for each individual Storyline module? If it's different for each module then I will always need to modify the player.css document. If it's the same I will just need to replace a newly published player.css document with one that has already been modified (saving me a lot of time). Does anyone know?

Thanks.