body
 {
 margin: 0px;
 color: #0099CC;
 font-family: Arial;
 font-size: 14px;
}
.main
 {
 width: 100%;
 height: 100%;
}

.top
 {
   width: 100%;
   height: 64px;
   background-image: url(images/bg_top.jpg);
   background-repeat: repeat-x;
  background-position: top;
}

.contenido
 {
 width: 800px;
 height: auto;
}