styles.css

body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(135deg, #f6d365 0%, #fda085 100%);
    margin: 0;
    font-family: Arial, sans-serif;
}

.calculator {
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.2);
    width: 300px;
}

.calculator-display {
    width: 100%;
    height: 60px;
    text-align: right;
    font-size: 24px;
    padding: 10px;
    margin-bottom: 20px;
    border: 2px solid #ddd;
    border-radius: 5px;
    box-sizing: border-box;
    background-color: #f3f3f3;
}

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

.btn {
    width: 100%;
    height: 60px;
    font-size: 20px;
    border: none;
    border-radius: 10px;
    background-color: #f1f1f1;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

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

.btn:active {
    background-color: #ccc;
    transform: scale(0.98);
}

.operator {
    background-color: #f9a825;
    color: #fff;
}

.operator:hover {
    background-color: #f57f17;
}

.operator:active {
    background-color: #ef6c00;
}
.equals {
    background-color: #ff7043;
    color: #fff;
    grid-column: span 2;
}

.equals:hover {
    background-color: #ff5722;
}

.equals:active {
    background-color: #e64a19;
}