Using stylesheets makes it much easier to maintain the look and feel of numerous pages. This will add to a consistent look and feel. Don't use dark backgrounds Dark backgrounds tend to make text less readable. So avoid dark colors or dark backgroundimages. Don't cram your pages, use colspan and borderspan for tables and vspan and hspan for applets and images.
Tables are very flexible.
They're able to get almost anything more or less visible on a screen. But by putting large elements in a table cell you might force the cells to become too large. Thus making horizontal scrolling necessary. Use only a limited number of frames. Always check if the screen doesn't get crammed if a low resolution screen is used.