请问如何修改这个底部的宽度，原来是width:1130px的，想改成980px，并且整体居中显示，和主页内容保持一致。还有蓝色背景部分的字如何居中。CSS代码如下：
/*bottom样式*/
.bottom_box{clear:both;text-align:left;}
.db_bg1{clear:both;overflow:hidden;background:rgb(153,38,88);}
.db_lxwm_box{clear:both;overflow:hidden;padding:30px 0px;positioN:relative;}
.db_lxwm_box li.db_left{float:left;width:330px;}
.db_lxwm_box li.db_left span{display:block;}
.db_lxwm_box li.db_left .db_span1{font-size:16px;color:rgb(255,200,224);line-height:25px;}
.db_lxwm_box li.db_left .db_span2{font-size:30px;font-family:Arial,Helvetica,sans-serif;color:rgb(255,200,224);line-height:25px;padding-top:15px;}
.db_lxwm_box li.db_left .db_span3{color:rgb(203,82,134);line-height:20px;padding-bottom:10px;}
.db_lxwm_box li.db_left .db_span4{color:rgb(255,200,224);line-height:20xp;}
.db_lxwm_box li.db_center{float:left;width:430px;margin-left:25px;}
.db_lxwm_box li.db_center div.db_ss{clear:both;overflow:hidden;width:100%;margin:40px 0px 20px 0px;}
.db_lxwm_box li.db_center div.db_ss input.db_ss_left{float:left;width:366px;padding:2px 7px;line-height:25px;height:25px;border:0px;}
.db_lxwm_box li.db_center div.db_ss input.db_ss_right{float:left;width:50px;line-height:26px;height:29px;border:0px;background
212958;color:white;font-size:14px;cursor:pointer;}
.db_lxwm_box li.db_center div.sb_rmss{clear:both;overflow:hidden;}
.db_lxwm_box li.db_center div.sb_rmss span{float:left;color:rgb(255,200,224);margin-right:5px;line-height:25px;}
.db_bg2{background-color:rgb(33,41,88);line-height:30px;padding:10px 0px;color:rgb(87,98,161);}
