* {
 margin: 0;
 padding: 0;
}

body {
 height: 100%;
 top: 0px;
 bottom: 0px;
}

.contenedor {
 position: absolute;
 left: 50%;
 top: 0px;
 width: 950px;
 margin-left: -475px;
 height: 650px;
 margin-top: 0px;
 margin-bottom: 0px;
 background-color: #D5D5D5;
 z-index: 0;
}

.top{
 width: 950px;
 height: 200px;
 align: left;
 clear: both;
 display: block;
 float: left;
 z-index: 1;
}

.logo{
 width: 950px;
 height: 200px;
 float: left;
 display: block;
 z-index: 1;
}

.banner{
 position: absolute;
 top: 60px;
 left: 500px;
 width: 360px;
 height: 200px;
 float: right;
 block: display;
 z-index: 2;
}

.demo{
 position: absolute;
 top: 0px;
 left: 800px;
 width: 142px;
 height: 92px;
 z-index: 3;
}

.menu {
 position: absolute;
 width: 950px;
 height: 40px;
 clear: both;
 top: 200px;
 display: block;
 float: left;
 z-index: 2;
}

#menu2{
 width: 250px;
 height: 190px;
 position: absolute;
 top: 345px;
 left: 95px;
 align: center;
 z-index: 2;
}

.contenido {
 position: absolute;
 width: 950px;
 height: 450px;
 top: 200px;
 float: left;
 z-index: 1;
}