.alert {
    padding: 15px;
    margin-top: 15px;
    margin-bottom: 20px;
    border: 1px solid transparent;
    border-radius: 4px;
    font-family: sans-serif;
    font-size: 12px;
    line-height: 1.5;
}

.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.alert-danger {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

.alert strong {
    font-weight: bold;
}

[role="alert"] {
    aria-live: assertive;
}