body {
  background-color: #8d8d8d;
}
.contenedor {
  margin: auto;
  position: relative;
  background-color: #666;
  width:960px;
  height:813px;
}
#content {
  margin: auto;
  position: relative;
  background-color: white;
  width:960px;
  height:732px;
}
#botonera {
  margin: auto;
  position: relative;
  background-color: white;
  width:960px;
  height:81px;
}