Bootstrap grid system is not working in my WordPress theme

I’m a long time WordPress user but this is the first time I dared to build my own theme (while following a tutorial though). I’m trying to use Bootstrap as the layout tool for the theme, but for some reason I can’t get it to work. Here is the work-in-progress:

http://youtubeen.com/

I’m expecting the three divs with class=”col-md-4″> to sit next to each other horizontally. Instead they stack on top of each other. Is my Bootstrap not loading properly here or what could be the issue?

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It is not really a WordPress related question, more a html/css question for Stack Overflow.

But i did look at your code, you are using Bootstrap 2.3.

*/
 * Bootstrap v2.3.2
 *
 * Copyright 2013 Twitter, Inc
 * Licensed under the Apache License v2.0
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Designed and built with all the love in the world by @mdo and @fat.
 */

You should load the latest version (3.3.6) to use col-md-4 for your containers.