.calculator {
    max-width: 400px;
    margin: 50px auto;
    padding: 20px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.calculator input[type="number"] {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ccc;
    border-radius: 5px;
}

.calculator button {
    width: 100%;
    padding: 10px;
    margin-top: 10px;
    background-color: #73B374;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

.calculator button:hover {
    background-color: #66a166;
}