body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.calculator {
    background: #fff;
    padding: 20px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    text-align: center;
}

h1 {
    font-size: 24px;
    margin-bottom: 10px;
}

input {
    width: 90%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 16px;
}

button {
    padding: 10px 15px;
    margin: 5px;
    font-size: 18px;
    border: none;
    border-radius: 5px;
    background: #007bff;
    color: white;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background: #0056b3;
}


#showAnswer {
    margin-top: 15px;
    font-size: 20px;
    font-weight: bold;
    color: #333;
    padding: 10px;
    border-radius: 5px;
    background: #f3f3f3;
}