Something wrong with my CSS Stylesheet

Ok lets try it again:

There is something wrong with my stylesheet I dont know how to fix this but its not a big deal.

If you look to the following screenshot:
CLICK HERE FOR THE SCREENIE

You see that the “Kalender” bar isnt at the same height as the “Hallo wereld!” bar

This is my CSS stylesheet:

/*
Theme Name: MARQUE
Theme URI:
Description: Designed
Author: Design Blog
Author URI:
? 2008, Design Blog. All rights reserved.
*/

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The name of the left sidebar is menu-left

Thanks for helping me out