Mystile – webpage width

Hi There,

I need desperate help my up and coming website alchemyandco.net
I would the actual width of the website to be much narrower. I inputed the right codes to bring in the tabs etc but as you can see i am having massive problems with the text. Ive used the tab function to get around this but as you zoom in and out on the page it doesn’t stayed center alligned.

I would like the width of the website to be much narrower. I would like the tabs, the slider and the text all to line up nicely in a narrower format very much like mrporter.com