.whc-container {
    max-width: 400px;
    margin: 0 auto;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 10px;
    background-color: #f9f9f9;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.whc-container h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #333;
}

.whc-input-group {
    margin-bottom: 15px;
}

.whc-input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #555;
}

.whc-input-group input {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 16px;
}

.whc-input-group small.whc-help-text {
    display: block;
    margin-top: 5px;
    font-size: 12px;
    color: #777;
}

#whc-calculate {
    width: 100%;
    padding: 10px;
    background-color: #0073aa;
    color: #fff;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
}

#whc-calculate:hover {
    background-color: #005177;
}

#whc-result {
    margin-top: 20px;
    text-align: center;
    font-size: 18px;
    font-weight: bold;
    color: #333;
}