body
{
    background-image: url('images/graviste_20151117_0001.jpg');
    background-attachment: fixed;
  background-repeat: no-repeat;
  background-position: center;
  background-size: cover;
}

.logo_principal
{
	width: 110px;
}

header
{
	background-color: green;
	width: 100%;
	padding-top: 8px;
	padding-bottom: 8px;
	text-align: right;
	opacity: 0.8;
}

nav
{
	display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
	background-color: green;
	width: 100%;
	padding-top: 4px;
	padding-bottom: 4px;
	color: yellow;
	font-size: 1.05em;
	
	}
	
	nav a
{
	display: inline-block;
	width: 148px;
	padding-top: 2px;
	padding-bottom: 2px;
	margin-left: 6px;
	margin-right: 6px;
	border-radius: 6px;
	border: 1px solid #002060;
	color: yellow;
	text-align: center;
	vertical-align: middle;
	text-decoration: none;
}

    footer
{ 
	text-align: right; 
	color: yellow;
	bottom: 0px;
	position: fixed;
	right: 6px;
	left: 8px;
	padding: 4px;
	background-color: green;
	opacity: 0.8;
}

h1
{ color: yellow;
  text-align: center 
}

p 
{ color: red;
  font-size: xx-large; 
  text-align: center 
  }