body{
	padding: 0;
	margin: 0;
	box-sizing: border-box;
	display: flex;
	align-items: center;
	justify-content: center;
	height: 100vh;
	width: 100%;
	background: #ecf0f3;

}
.container{
	width: 45%;
	min-height: 45vh;
	padding: 10px;
	border-radius: 8px;
	box-shadow: 12px 12px 20px #cbced1, -12px -12px 20px #ffffff;

}
.display #screen{
	width: 97%;
	height: 70px;
	font-size: 35px;
	outline: none;
	border: none;
	text-align: right;
	padding-right: 10px;
	border-radius: 6px;
	background: #ecf0f3;
	box-shadow: inset 8px 8px 8px #cbced1, 
				inset -8px -8px 8px #ffffff;
}

.btns{
	width: 100%;
	margin-top: 1.7em;
	display: flex;
	align-items: center;
	justify-content: center;
	flex-direction: column;
}
.btns .row button{
	width: 80px;
	height: 30px;
	font-size: 16px;
	border: none;
	outline: none;
	margin: 5px;
	border-radius: 4px;
	box-shadow: 5px 5px 8px #00000020,
				-5px -5px 8px #ffffff; 
}
.btns .row button:hover{
	background-color: #000;
	color: #fff;
	transition: 0.3s ease;
}
eval{
	background-color: #33ccff;
	color: #ffffff;
	box-shadow: inset 5px 5px 8px #66d9ff
				inset -5px -5px 8px #00ace6;

}