.ctwc-calculator {
    background: #f9f9f9;
    padding: 20px;
    border-radius: 5px;
    max-width: 500px;
    margin: auto;
}

.ctwc-calculator h2 {
    text-align: center;
}

.ctwc-calculator label {
    display: block;
    margin-top: 10px;
}

.ctwc-calculator input,
.ctwc-calculator select {
    width: 100%;
    padding: 8px;
    margin-top: 5px;
}

#ctwc-calculate {
    margin-top:15px;
    margin-bottom:15px;
    width: 100%;
    background-color: #1e73be;
    color: white;
    border: none;
    cursor: pointer;
}

#ctwc-calculate:hover {
    background-color: #1695cb;
}

#ctwc-results {
    margin-top: 20px;
    background: #e8f5e9;
    padding: 15px;
    border-radius: 5px;
}