@charset "utf-8";
h1{
	color: red;
	font-family: arial;
}
header{
padding: 2em;
color:black; 
background-color:skyblue ;
}
footer{
	background-color: skyblue; 
padding:2em;
font-family: verdana;
font-size: 20px;
color: blue;
}
body{
	background-image: url(informatica.jpg);

}
.caja{
	font-family: cursive;
	width: 80%;
	margin-left: auto;
	margin-right: auto;
	margin-top: 1em;
	background-color:skyblue ;
	opacity: 90%;
}

ul {
	list-style-type:none;
	margin:0;
	padding:1em;
	display:flex;
	flex-direction: row;
}
li { flex-grow: 1; }
a {
	display:block;
	padding:1em;
	background-color:blue ;
	text-align:center;
	margin-right:0.2em;
	text-decoration:none;
	color:lightblue;
}
a:hover {background-color:; }