* {
	box-sizing: border-box;
}

body {
	font-family: Arial, sans-serif;
	background-color: #f5f5f5;
	margin: 0;
	padding: 0;
	display: flex;
	justify-content: center;
	align-items: center;
	height: 100vh;
}

#calculator {
	border: 1px solid #cccccc;
	background-color: white;
	border-radius: 0.25em;
	box-shadow: 0 0 0.5em rgba(0, 0, 0, 0.1);
	display: flex;
	flex-direction: column;
	align-items: center;
	padding: 1em;
}

#display {
	padding: 0.25em;
	display: grid;
	grid-template-columns: repeat(3, auto);
	gap: 0.25em;
	border: 1px solid #f5f5f5;
}

#buttons {
	display: flex;
	flex-direction: row;
	border: 1px solid #f5f5f5;
}

#numbers {
	padding: 0.25em 0.25em 0.25em 0.25em;
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 0.25em;
}

#zero {
	grid-column: 1 / 3;
}

#operators {
	padding: 0.25em 0.25em 0.25em 0em;
	display: grid;
	grid-template-columns: repeat(2, 1fr);
	gap: 0.25em;
}

#equal {
	grid-column: 1 / 3;
}

input {
	font-size: 2em;
	width: 7.75em;
	height: 2.5em;
	text-align: right;
}

button {
	font-size: 2em;
	min-width: 2.5em;
	min-height: 2.5em;
	border: none;
	cursor: pointer;
	background-color: #f5f5f5;
}

button:hover {
	background-color: #dddddd;
}