body {
    background-color: #f0f2f5;
}
.card {
    border-radius: 15px;
}
.btn-success {
    background-color: #28a745;
    border: none;
}
.btn-success:hover {
    background-color: #218838;
}
.alert-info {
    background-color: #d4edda;
    color: #155724;
    border: none;
}