To start a table, the number is the thickness of the border, from 0 and up. Note You can put a link, or an image in a cell. The cell stretches to the size of it's content.
Tables look different to different computers also.
Some computers run at different screen resolutions, or they may be using large fonts. Keep this in mind when you try to get picky about how your information is displayed in the cells. To start a table, the number is the thickness of the border, from 0 and up.