.alert {
    padding: 20px;
    margin-bottom: 15px;
    border: 1px solid transparent;
    border-radius: 4px;
    display: none;
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    width: 80%;
    max-width: 600px;
}
.alert-success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}
.alert-error {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}