.calculator-container {
    max-width: 400px;
    margin: 20px auto;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 5px;
    background-color: #f9f9f9;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.calculator-container h2 {
    font-size: 1.5em;
    margin-bottom: 15px;
}

.calculator-container input,
.calculator-container select,
.calculator-container button {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}