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

.calculator {
	
	height: 80%;
	
	padding: 30px;
	font-family: Times new roman;
	background-color: white;
	border: 2px solid black;
	box-shadow: 5px 5px 5px 5px;
	background-color: #3a3a3a;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    padding: 20px;
    width: 280px;
    
}

.display {
    background-color: #1e1e1e;
    border-radius: 5px;
    padding: 20px;
    font-size: 2rem;
    text-align: right;
    color: #00ff00;
    margin-bottom: 20px;
}

.buttons {
    display: flex;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
	margin:5px;
}

.btn {
    background-color: #4e4e4e;
    border: none;
    border-radius: 5px;
    padding: 20px;
    font-size: 1.5rem;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease;
    color: #fff;
	margin:5px;
}

.btn:hover {
    background-color: #616161;
}

.btn:active {
    transform: scale(0.95);
}

.operator {
    background-color: #ff9500;
}

.operator:hover {
    background-color: #ffa733;
}

.clear {
    grid-column: span 4;
    background-color: #ff3b3b;
}

.clear:hover {
    background-color: #ff6f6f;
}

@media (max-width: 400px) {
    .calculator {
        width: 100%;
        padding: 10px;
    }
}