MediaWiki:Common.css/WikiTable.css

 /*******************************/
 /* wikitable/prettytable class */
 /*******************************/
 
 /* wikitable/prettytable class for skinning normal tables,
    but don't skin tables within tables by accident */

 table.wikitable, table.prettytable { margin:1em 0em; background:#f9f9f9; border:1px #aaaaaa solid; border-collapse:collapse; }
 table.wikitable>*>tr>th,
 table.wikitable>*>tr>td,
 table.wikitable>tr>th,
 table.wikitable>tr>td,
 table.prettytable>*>tr>th,
 table.prettytable>*>tr>td,
 table.prettytable>tr>th,
 table.prettytable>tr>td
 {
   border: 1px #aaaaaa solid;
   padding: 0.2em;
 }

 table.wikitable>*>tr>th,
 table.wikitable>tr>th,
 table.prettytable>*>tr>th,
 table.prettytable>tr>th
 {
   background: #ccccff;
   text-align: center;
 }

 table.wikitable caption, table.prettytable caption { margin-left:inherit; margin-right:inherit; }