Cabecera: header

	<style type="text/css">
	h1 {color: red;}
	.cabecera > h1 {
		font-size: 42px;
	}
	#caja {
		display:block;
		margin-left: auto;
		margin-right: auto;
		background-color: #eee;
		width: 800px;
		height: 840px;
		font-family: Calibri, Arial, Helvetica;
		font-size: 16px;
		color: #000;
		padding: 20px;
	}
	#caja .cabecera {
		background-color: #ccc;
	}
	#caja .cabecera h1 {
		font-family: Calibri, Helvetica, Arial;
		font-size: 30px;
		font-weight: 400;
		color: #fff;
		padding: 5px;
	}
        </style>