Maybe you mean the .megawrapper container that holds the dropdowns? - it is generated in the JavaScript and not specifically declared/referenced in the default CSS.
You can manipulate that in the CSS though if you use the !important override - something like;
Code:
.megawrapper { position:absolute !important; top:100px !important; left:0 !important; width:100% !important; }
This example makes the dropdowns all come from the absolute left of the screen, 100px from the top, instead of from under each button.
I did something similar for the megamenu that I used in the Fast Edit website http://fast-edit.co.uk/ except I declared a specific px width to match the wrapper of the template. This may or may not point you in the right direction but further clarification and a link, as Nile has already mentioned, would be the best way to offer you specific help.
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