.wr-calculator {
    max-width: 400px;
    margin: 20px auto;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    background: #f9f9f9;
    text-align: center;
}
.wr-calculator input {
    width: 90%;
    margin: 10px 0;
    padding: 8px;
}
.wr-calculator button {
    padding: 10px 20px;
    background: #0073aa;
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 5px;
}
#wrResult {
    margin-top: 15px;
    font-weight: bold;
}