The typical thing was a fixed width container table wrapped with <CENTER> tags. Then you set textalign on that table. Voilá your table fit all your content with

The typical thing was a fixed width container table wrapped with <CENTER> tags. Then you set textalign on that table. Voilá your table fit all your content with a fixed size/aspect but would float center on the page of someone with larger than 800x600 or whatever minimum you designed for.