div.quadrato { 
position:relative; 
width: 9em; 
margin: 3px; 
background-color: #222; 
} 

div.top-left-corner, div.bottom-left-corner, div.top-right-corner, div.bottom-right-corner {position:absolute; width:20px; height:20px; background-color:#000; 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:#222; 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:#CCCCCC;} 


div.quadratoUser { 
position:relative; 
width: 9em; 
margin: 3px; 
background-color: #222; 
} 

div.quadratoUser-contenuto {position: relative; padding: 8px; color:#CCCCCC;}