*{
	margin: 0;
	padding: 0;
	-webkit-box-sizing:border-box;
	-moz-box-sizing:border-box;
	box-sizing: border-box;
}


#contenido
{
	padding:3em;
	margin: .9em auto;
	width: 28%;
	background: blue;
	text-align: center;
	color: white;

}

#contenido:hover{
	
	padding: 35px 28px;
	transform: scale(1.1,1.2);
}

strong{
	font-size: 140%;
}

.btn-descargar{
	color: greenyellow;
	font-size: 140%;

}

body{
	margin-bottom: 10em;
	background: url("../img/fondoheader.png");
	background-repeat: no-repeat;
	background-size: 100% 100%;
}


.btn-regresar{
	margin-left: 40px;
	font-family: calibrí;
	font-size: 140%;
	text-decoration: none;

}


@media only screen and (min-width: 481px) and (max-width: 768px) {


 #contenido
{
	width: 60%;
}



}



@media only screen and ( orientation: landscape) and (min-width: 769px) and (max-width: 900px)   {


 #contenido
{
	width: 50%;

}


}


@media only screen and ( orientation: landscape) and (min-width: 900px) and (max-width: 1100px)   {


 #contenido
{
	width: 50%;

}



}


@media only screen and (min-width: 320px) and (max-width: 480px) {


 #contenido
{
	width: 60%;
}



}