You can set properties of a table.
 
Firstly, locate the cursor in a table and click "Main Menu->Format->Table Properties" successively. Then a "Table Properties" dialog will be displayed:
 
 
Alignment: Set an alignment fashion of the table;
Cell padding: Set the padding of cell;
Cell spacing: Set the spacing of cell;
Specify width/height: Specify the width and the height of the table; Either pixels or percent are used as unit; 
Broders Size: The size of broder (pixel);
Broders Color/Light border/Dark border: Set a color for border;
Background Color: Set a background color for the table;
Use background picture: Set a picture as the background of the table.