body {
	font-family: 'Roboto', sans-serif;
	max-width: 600px;
	text-align: center;
	margin: 10px auto;
	font-size: 100%;
	background: #FEFEFE;
}

.container {
	display: inline-block;
	width: 50%;
	padding: 5%;
	margin: auto;
	background: #FFF;
	color: #000;
	font-size: 2rem;
	font-weight: 300;
	box-shadow: 0 1px 2px 0 rgba(0,0,0,0.1), 0 1px 8px 0 rgba(0,0,0,0.1);
	
}

.calc  div {
	display: inline-block;
	width: 80%;
	padding: 5%;
	margin: 5%;
	cursor: pointer;
	border: 1px solid #fff;
	background-color: #ECEFF1;
	box-shadow: 0 1px 2px 0 rgba(0,0,0,0.1), 0 1px 8px 0 rgba(0,0,0,0.1);
	-webkit-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	user-select: none;
}

#screen {
	width: 55%;
	box-shadow: 0 1px 2px 0 rgba(0,0,0,0.1), 0 1px 8px 0 rgba(0,0,0,0.1);
	
}