#main {
	width: 900px;
	margin-right: auto;
	margin-left: auto;
	height: auto;
}
#bt_alto {
	float: left;
	height: 98px;
	width: 900px;
}
#xn_logo {
	float: left;
	height: 98px;
	width: 250px;
}
#xn_scritta {
	float: left;
	height: 98px;
	width: 198px;
}
#xn_fla {
	float: right;
	height: 80px;
	width: 200px;
}
#xn_menu {

	float: right;
	height: 39px;
	width: 460px;
}