body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f4f9;
}

header {
    background: #333;
    color: #fff;
    padding: 1rem;
}

header a {
    color: #fff;
    text-decoration: none;
    margin-right: 15px;
}

.container {
    padding: 2rem;
    max-width: 1200px;
    margin: auto;
}

.alert {
    padding: 10px;
    background: #d4edda;
    color: #155724;
    margin-bottom: 20px;
    border-radius: 4px;
}

.card {
    background: #fff;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.btn {
    padding: 10px 15px;
    background: #007bff;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
}

.btn-danger {
    background: #dc3545;
}