* {
	box-sizing: border-box;
}

body {
	font-family: Arial, sans-serif;
	background-color: #f2f2f2;
	padding: 150px;
}

.calculator {
	background-color: white;
	padding: 20px;
	max-width: 300px;
	border: 1px solid #ccc;
}

h1 {
	font-size: 24px;
}

label {
	display: block;
}

input[type="number"] {
	width: 100%;
	padding: 8px;
	margin-top: 5px;
}

.option {
	margin-top: 10px;
	display: flex;
	align-items: center;
}

p {
	margin-top: 20px;
	font-size: 20px;
	font-weight: bold;
}

button {
	margin-top: 10px;
	padding: 10px 15px;
	cursor: pointer;
}