.tabella_b0 {
	border-collapse: collapse;
	border-width: 0;
}
.tabella_b1 {
	border-collapse: collapse;
	border-style: solid;
	border-width: 1px;
}
.tabella_b2 {
	border-collapse: collapse;
	border-style: solid;
	border-width: 2px;
}
.tabella_b4 {
	border-collapse: collapse;
	border-style: solid;
	border-width: 4px;
	border-color: #0000FF;
}
.tabella_b6 {
	border-collapse: collapse;
	border-style: solid;
	border-width: 6px;
	border-color: #99CCFF;
}