@charset "utf-8";
header {
	background-color: orange;
	color: white;
	text-align:center;
}
.caja1 {
        text-align:center;
	margin-bottom:3em;
}
.caja2 {font-style: arial;
	text-align:center;
	margin-bottom:3em;
}
.caja3 {font-style: italic;
	text-align:center;
	height: 400px;
	width: 400px;
	border: 3px solid orange;
        margin: 0 auto;
}	
em {
    background-color: yellow;
}