header,section,nav,footer{
  border-style: dotted;  /*estilo de borde*/
  border-color:#003366; /*color de borde */
  position:absolute;
  background-color: #c1c1c1;  
}
header,footer{
  height: 12%; /*alto*/
  width: 90%;  /*ancho*/		 
}
header,nav,footer{
	left:5%;
}
header{
	  background: -webkit-linear-gradient(red, blue);
	top:2%;
	border-radius:0px 0px 15px 15px;
} 
nav{
    top:16%; 
    width:10%;
    height:70%;
}
section{
	width:78%;
	top:16%;
	left:17%;
	height:70%;
}
footer{
	top:88%;
	box-shadow: orange -9px -9px 4px;
}