.custom-postage-calculator .shipping-calculator-form {
    background-color: #000;
    color: #fff;
    padding: 20px;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.custom-postage-calculator .shipping-calculator-form:hover {
    background-color: #fff;
    color: #000;
    border: 1px solid #000;
}

.custom-postage-calculator .shipping-calculator-form p,
.custom-postage-calculator .shipping-calculator-form label {
    color: inherit;
}

.custom-postage-calculator .shipping-calculator-form select,
.custom-postage-calculator .shipping-calculator-form input[type="text"] {
    background-color: #fff;
    color: #000;
    border: 1px solid #333;
    padding: 10px;
    width: 100%;
    margin-bottom: 10px;
}

.custom-postage-calculator .shipping-calculator-form:hover select,
.custom-postage-calculator .shipping-calculator-form:hover input[type="text"] {
    background-color: #000;
    color: #fff;
    border-color: #ccc;
}

.custom-postage-calculator .shipping-calculator-form button[type="submit"] {
    background-color: #fff;
    color: #000;
    border: 2px solid #fff;
    padding: 10px 20px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s ease;
}

.custom-postage-calculator .shipping-calculator-form:hover button[type="submit"] {
    background-color: #000;
    color: #fff;
    border-color: #000;
}