Edit featured thumbnail?

[ckubs]

Hello, here is what I want to achieve:
The Omega article thumbnail has fixed dimensions(or atlast mine is since I chose it in the theme settings to be wp thumbnail and made it 200×200 in media settings), and I want to keep that but on 480px screens counting the left and right margins and the 200px width of the image there is little less space for the wrapped excerpt and it looks bad.

I put already a clear and display block for the thumbnail in a Css media query to move the excerpt on the bottom but I wanted to make it full width too and setting it 100% width didn’t solved nicely the problem as the result was a 200px image enlarged to almost 480px.

So, I found a small plugin that let’s me define and use the media queries outside the CSS with if’s( if screen size is … do…etc), to have another thumbnail size( like wp medium) for screens under 480px but I don’t know exactly in what file to find the code for post thumbnails, or … I have a hook for that?

Thanks for any response.

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