div.content
{
	margin:100px;
	margin-bottom:0px;
	margin-top:25px;
}

#products, #controlling, 
#security, #references{
	
	text-align: center; 
	float:left; 
	border: #000 1px solid;  
	height: 50px; 
	width: 200px;
	padding-top: 25px;
	margin-top: 2px;
	margin-right: 2px;
}

a{text-decoration:none;}

#products{background-color: #d0cfc8;}
#controlling{background-color: #74b2dc;}
#security{background-color: #f5b270;}
#references{background-color: #fff;}

#products:hover{ background-color: #fff;}
#controlling:hover{ background-color: #f5b270;}
#security:hover{ background-color: #74b2dc;}
#references:hover{ background-color: #d0cfc8;}