Rails - Jun 2014 - Colloring HTML elements depending on what action is called

Hi fellows. I'm requiring a suggestion, a hand, since can't solve this.
What I'm trying to do is this:

 I have 2 actions by a controller. There's an active layout for
both(application.html.erb). There's two HTML elements defined in the
layout which I want to be collored diferently if one action is called or
the another. I suspect that can be done with Javascript, but must be an
easy way. What I though is that when I call one of the actions, it must
render a specific CSS file, which overwrite the style of the HTML
elements, giving to them the color I want, but....I can't give with it,
can't get it work correctly. Can you give me a clue about what should I
do, I've been around this a whole day.

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