.example5 textarea:required {
    border-left: 4px solid #e74c3c;
    background-color: #fdf2f2;
}

.example5 textarea:optional {
    border-left: 4px solid #27ae60;
    background-color: #f2fdf2;
}

.example5 textarea {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    resize: vertical;
    min-height: 100px;
}

.example5 label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}