Specify the number of columns you would like your table to have. If you want your table to have a specific width, be sure to check the box and specify a dimension in the text box. Width in percent means percent of the page, regardless of what size the page is on any viewer's screen. A border size of 0 will give you a table with no visible grid lines. This kind of table can be used very effectively for page layout.
Different monitors have different pixel maximums.
An old monitor, for example, will not be able to display more than 640 pixels horizontally and 480 pixels vertically. Some of this space will be used up by the browser itself. As a general rule, tables should not be more than 550 pixels wide. Add your Content. Add your content to the cells by clicking on a cell and typing or pasting text or images.