.calc-container {
    background: #f9f9f9;
    border: 1px solid #ddd;
    padding: 20px;
    max-width: 400px;
    border-radius: 10px;
}
.calc-container label {
    display: block;
    margin-bottom: 8px;
}
.calc-container input, .calc-container select {
    width: 100%;
    padding: 5px;
    margin-top: 3px;
}
.calc-container button {
    margin-top: 10px;
    width: 100%;
    padding: 8px;
    background: #0073aa;
    color: white;
    border: none;
    border-radius: 5px;
}
#resultado {
    margin-top: 15px;
    background: #fff;
    padding: 10px;
    border-radius: 5px;
}