#topo{
   width: 900px;
   height: 177px;
   background: rgb(119 136 153);
   position: absolute;
   top: 5px;
   left: 180px;
}

#conteudo{
   width: 900px;
   height: 400px;
   background: rgb(205 201 201);
   position: absolute;
   top: 177px;
   left:180px;
}

#rodape{
   width: 900px;
   height: 100px;
   background: rgb(119 136 153);
   position: absolute;
   top: 490px;
   left: 180px;
}