div.quadrato { 
	position:relative; 
	width: 9em; 
	margin: 3px; 
	background-color: #000;
} 

div.top-left-corner, div.bottom-left-corner, div.top-right-corner, div.bottom-right-corner {
	position:absolute;
	width:20px;
	height:20px;
	background-color:#FFF;
	overflow:hidden;
} 

div.top-left-inside, div.bottom-left-inside, div.top-right-inside, div.bottom-right-inside {
	position:relative; 
	font-size:150px; 
	font-family:arial; 
	color:#000; 
	line-height: 40px;
} 

div.top-left-corner { 
	top:0px; 
	left:0px; 
} 

div.bottom-left-corner {
	bottom:0px; 
	left:0px;
} 

div.top-right-corner {
	top:0px;
	right:0px;
} 

div.bottom-right-corner {
	bottom: 0px; 
	right:0px;
} 

div.top-left-inside {
	left:-8px;
} 

div.bottom-left-inside {
	left:-8px;
	top:-17px;
} 

div.top-right-inside {
	left:-25px;
} 

div.bottom-right-inside {
	left:-25px;
	top:-17px;
} 

div.quadrato-contenuto {
	position: relative;
	padding: 8px;
	color:#FFF;
	text-align:center;
	line-height:18px;
}