Widening Website Dimensions

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I have an old site I built with a width of 800 pixels. I would like to expand that to 955 pixels, but it messes up the toolbar to the point of no return. I was a beginner when building this site, and I may have ruined any chances I had when I first built the site, but is there a trick to expanding a site while maintaining the objects? I have attached the file that is my attempt at widening the site, but I may have to rebuild.