table{border-collapse:collapse; border-spacing:0; border-left:1px solid #aaa; border-top:1px solid #aaa; } td{border-right:1px solid #aaa; border-bottom:1px solid #aaa; padding:3px 15px; text-align:left; color:#3C3C3C;}
更多参考：http://www.cnblogs.com/pricks/archive/2012/10/31/2748247.html