body {
    background-image: url("bg.jpg");
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-image: url('bg.jpg');
    background-size: cover;
    background-position: center;
    height: 100vh;
}

.heading {
    color: white;
    font-size: 4rem;
    text-align: center;
    margin-bottom: 20px;
    text-decoration: underline;
}

.calculator-body {
    background-color: black;
    padding: 20px;
    border-radius: 10px;
    width: 300px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.input-field {
    width: 96%;
    height: 50px;
    padding: 4.5px;
    font-size: 1.5rem;
    border: 2px solid blue;
    border-radius: 5px;
    margin-bottom: 20px;
    text-align: right;
    background-color: white;
}

.row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}

.button {
    width: 60px;
    padding: 15px;
    font-size: 1.5rem;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.button-operator {
    background-color: orange;
}

.button-number {
    background-color: #1f3a93;
}

.button-equal {
    background-color: green;
}

.button:hover {
    opacity: 0.9;
}

.button:active {
    transform: scale(0.98);
}