#iht-calculator {
    background-color: #f8f8f8;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    max-width: 600px;
    margin-bottom: 25px;
}

#iht-calculator h3 {
    color: #333;
    font-size: 1.2em;
    margin-bottom: 10px;
}

#iht-calculator label {
    display: block;
    margin-top: 10px;
    color: #555;
}

#iht-calculator input {
    width: 100%;
}

#iht-calculator input[type="number"] {
    min-width: 100%;
    width: 100%;
    padding: 8px;
    margin-top: 5px;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}

#iht-result {
    margin-top: 20px;
    padding: 10px;
    background-color: #e9ecef;
    border: 1px solid #ced4da;
    border-radius: 4px;
    color: #495057;
}