stumped by div tag centering

Stare

I'm new to this CSS stuff. I'm trying to position a DIV TAG exactly in the center of the page. I want it to move with the actual page, ie be centered within the browser. For some reason, I cannot get the TAG properties to conform to the specifics im trying to give it. Also, on top of that, the FORM that i'm trying to embed within the TAG is not showing up whatsoever. Does anyone know what the hell I'm doing wrong? Any help would be amazing.
~ Dave

TAG in Question --- buybooklayer

 

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