body
{
	background:url("css/fondo.png");
	background-attachment: fixed;
	background-size: auto 100%;
	background-position: bottom center;
}

img {
	max-width: 100%;
}

.contenido
{
	border:3px #666666 solid;
	background: #ddd;
	margin: 40px auto;
	box-sizing: border-box;
}