body{
	box-sizing: border-box;
	margin: 0;
}

.calculator{
	background-color: #f2f2f2;
	padding: 20px;
	max-width: 400px;
	margin: 0 auto;
	border: solid 1px #ccc;
	box-shadow: 0 2px 5px rgba(0, 0, 0, .3);
	border-radius: 5px;
	margin-top: 40px;
}

#result{
	width: 95%;
	padding: 10px;
	font-size: 24px;
	border:none;
	box-shadow: 0 2x 5px rgba(0, 0, 0, 0.3) inset;
	border-radius: 5px;
	
}

.buttons{
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	grid-gap: 10px;
	margin-top: 20px;
}

button{
	padding: 10px;
	font-size: 24px;
	border: none;
	box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
	border-radius: 5px;
	cursor: pointer;
	transition: background-color0.3s ease;
}

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

.clear{
	background-color: #ff4136;
	color: #fff;
}

.number, .decimal{
	background-color: #fff;
	color: #333;
}

.operator{
	background-color: #0074d9;
	color: #fff;
}

.equals{
	background-color: #01ff70;
	grid-row: span 3;
	color: #fff;
}