.lec-container {
    max-width: 400px;
    margin: 0 auto;
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 5px;
    background-color: #f9f9f9;
}

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

.lec-input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

.lec-input-group input,
.lec-input-group select {
    width: 100%;
    padding: 8px;
    box-sizing: border-box;
}

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

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

.lec-results {
    margin-top: 20px;
    padding: 15px;
    background-color: #e9e9e9;
    border-radius: 5px;
}

.lec-results h3 {
    margin-top: 0;
}