#calculator {margin-bottom:2em;}
#calculator input {
	width:90px;
	height:90px;
	background:#ccc;
	color:maroon;
	font-size:50px;
	margin:0 3px 3px 0;
	border:2px outset #bbb;
}
#calculator input.last {
	margin-right:0;
	margin-bottom:0;
}
#calculator input:hover {
	background:#000;
	color:#ccc;
	border:2px inset #666;
	height:90px;
	width:90px;
}
#calculator input#felt, #calculator input#felt:hover {
	background:#aaa;
	color:maroon;
	text-align:right;
	padding:0;
	height:86px;
	width:285px;
	vertical-align:baseline;
	border:none;
}