calc.css

#calculator {
	border: 1px solid;
	width: 300px;
	overflow: auto;
	background: #ccc;
}
.io-field {
	border: 1px solid;
	height: 52px;
	margin: 5px;
	padding: 2px;
	text-align: right;
	overflow: hidden;
	position: relative;
	background: #fff;
}
.calculation, .collapsed-calculation {
	font-size: 10px;
	height: 14px;
	line-height: 14px;
}
.input {font-size: 16px;
	height: 24px;
	line-height: 24px;
}
.keyboard-input {
	opacity: 0;
	position: absolute;
	top: 0;
}
.numbers {
	margin: 5px;
	width: 120px;
	float: left;
}
.operations {margin: 5px;
	 width: 160px;
	 float: left;
 }
.button {
	width: 30px;
	height: 30px;
	padding: 0;
	font-size: 14px;
	line-height: 30px;
	text-align: center;
	border: 1px solid;
	cursor: pointer;
	float: left;
	margin: 4px;
	background: #fafafa;
}
.button.number-0 {
	width: 70px;
}