.error-message {
    color: #c0392b;          /* red */
    background-color: #fdecea;
    border: 1px solid #f5c6cb;
    padding: 8px 12px;
    margin-top: 10px;
    border-radius: 4px;
    font-size: 0.9rem;
    display: none;
}

.error-message.visible {
    display: block;
}