html {
	background: #000;
	color: #fff;
	display: flex;
	justify-content: center;
	align-items: center;
	height: 100vh;
}

.calculator-container {
	width: 250px;
	padding: 1rem;
	border-radius: 3px;
	background: #1c1c1c;
	display: flex;
	flex-direction: column;
	align-items: center;
}

input {
	width: 100%;
	height: 50px;
	margin-bottom: 1rem;
	font-size: 2rem;
	text-align: right;
	background: #000;
	color: #fff;
	border: none;
	outline: none;
	border-radius: 3px;
}

.grid {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 10px;
	width: 100%;
}

button {
	width: 100%;
	height: 60px;
	border-radius: 3px;
	border: none;
	outline: none;
	cursor: pointer;
	color: #fff;
	font-size: 1.5rem;
	display: flex;
	justify-content: center;
	align-items: center;
	transition: background .1s ease-in-out;
}

.number-button:hover {
	background: #2a2a2a9e;
}

.operator-button:hover {
	background: #ff9500b7;
}

.number-button:active {
	background: #595959;
}

.operator-button:active {
	background: #ffbd60b7;
}

.number-button {
	background: #2a2a2a;
}

.operator-button {
	background: #ff9500;
	font-size: 1.8rem;
}

.operator-button:nth-child(17) {
	grid-column: span 4;
	height: 60px;
	border-radius: 3px;
}

#evaluate:disabled {
	background: #fdd7a2;
}

.highlight {
	transition: all .2s ease-in-out;
	background: #e65a5a;
}