.about_top{width:1000px;height:112px;float:left;overflow:hidden;}
.about_btm{width:1000px;height:440px;float:left;}
.about_btm_img{width:438px;height:440px;float:left;overflow:hidden;}
.about_btm_content{width:550px;height:440px;float:left;text-align:left;color:#595757;padding-left:5px;}
.abt_btm_img{width:438px;height:440px;}
.abt_top_img{width:1000px;height:112px;}