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CSS

Simple css media query help!

Please someone help me, Im following the video of building a three column layout using css media queries rather than relying on a fluid layout. Video url is this- https://teamtreehouse.com/library/how-to-make-a-website/responsive-web-design-and-testing/build-a-three-column-layout . Please help here is the screenshot of my code. I am running chromium i believe to test this, on xubuntu. http://i.imgur.com/iy7O9Ar.png (screen shot of code!), so really the problem is its not collapsing into one! infacts it stays collapse, regardless of screen size (px)