body {
    font-family: Arial, sans-serif;
    margin: 40px;
}

h1 {
    color: #003366;
}

button {
    padding: 10px 20px;
    background: #003366;
    color: white;
    border: none;
    cursor: pointer;
}

button:hover {
    background: #0055aa;
}

.erreur {
    background: #ffe6e6;
    border: 1px solid #cc0000;
    padding: 10px;
    margin-top: 20px;
}

.feedback {
    background: #e6ffe6;
    border: 1px solid #009900;
    padding: 10px;
    margin-top: 20px;
}