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You may break the design of the template. Many places sell the same template in 2 different sizes being fluid and fixed. You may experience a vast amount of template issues in display by stretching a fixed template to a fluid position.
You can go to Style Manager >> Your Style >> StyleVars
There you can edit these properties. You can play with using pixel numbers only rather than using 100% try something like 960px. You probably do not have to put the px beside the number but it shouldn't hurt anything if you do. You will have to toy with these back and forth to get your desired effect.
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