.content, .presentacion, .sonido{
	text-align: center;
}



.footer{
	text-align: center;
	color:white;
	font-family:Arial,Helvetica,Sans-serif;
	font-size:x-small;
	margin-top:10px;
}

.footer a{
	color:white;
	text-decoration:none;
}

.footer a:hover { text-decoration: underline}