Yes, it was for you.
Try reading a css shorthand tutorial like this to help you:
http://webdesign.about.com/cs/css/qt/tipcsstrbl2.htm
For example, you could change it to:
margin:15px auto 10px;
which means 15px for the top, auto for the left and right, and 10px for the bottom.
Right now it is saying 10px for the top and bottom, and auto for left and right. The link I posted explains how it works in more detail.
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