.mainarea{  position:absolute;  top:151px;  width:100%;  bottom:0px;}.edit_wrap{  background:#fcfcfc;  padding:20px 18%;  position:absolute;  top:0px;  right:0px;  left:0px;  bottom:0px;  overflow-y: auto;}.edit_area{  height:1110px;  width:900px;  margin:20px auto;  padding:40px;}.mainarea    .edit_wrap        .edit_area