/* Custom CSS */
body {
    font-family: Arial, sans-serif;
    margin: 20px;
}
.alert {
    padding: 10px;
    margin-bottom: 15px;
    border-radius: 4px;
}
.alert-success { background-color: #d4edda; color: #155724; }
.alert-danger { background-color: #f8d7da; color: #721c24; }
.alert-warning { background-color: #fff3cd; color: #856404; }
.alert-info { background-color: #d1ecf1; color: #0c5460; }