html,
body {
	margin: 0;
	padding: 0;
	font-family: sans-serif;
}

#app {
	height: 100vh;
	display: flex;
	justify-content: center;
	align-items: center;
}

.calculator {
	width: 300px;
	display: grid;
	grid-template-areas:
		'total total total total'
		'modif modif modif oper'
		'digit digit digit oper'
		'digit digit digit oper'
		'digit digit digit oper'
		'digit digit digit oper';
	grid-auto-columns: 1fr;
	grid-auto-rows: 1fr;
	height: 500px;
}

button {
	font-size: 2rem;
	border: 0.5px solid #98999b;
}

.modifiers button {
	background-color: #ccc;
}

.operations button {
	background-color: orange;
}

.digits button {
	background-color: #efefef;
}

#total {
	grid-area: total;
	background-color: #333;
	color: white;
	margin: 0;
	padding: 1rem;
	display: flex;
	justify-content: flex-end;
	align-items: flex-end;
	font-size: 4rem;
}

.digits {
	grid-area: digit;
	display: flex;
	flex-wrap: wrap;
	flex-direction: row-reverse;
}

.digits button {
	flex: 1 0 30%;
}

.digit.wide {
	flex: 2 0 60%;
	order: 1;
}

.modifiers {
	grid-area: modif;
	grid-auto-flow: column;
	grid-auto-columns: 1fr;
}

.operations {
	grid-area: oper;
}

.subgrid {
	display: grid;
}