body{
text-align:center;
margin:0;
padding:0;
background-color:#F3F4F6;
}

.wrapper{
margin:0 auto;
text-align:left;
width:840px;

}

.top{ margin-bottom:0px;}
.middle{ height:393px; width:840px;}
.footer{margin-top:0px; background-color:#fff;}