Twentyten removing sidebar margins

Hi all,

I’m currently experimenting with Twentyten ’cause I want to transfer my design to a wordpress theme. My problem now is I’m having a hard time fixing the margins of the “primary” sidebar widgets.

View Image >>> https://i54.tinypic.com/24y9v1i.jpg

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In the image above, the content div is at the very edge of the page container, with 0 margins. How do I do that with the primary div while still maintaining float:right?

Thank you..