header {
    background-color: #233ba7;
    color: white;
    text-align: center;
    padding: 20px;
}

.bloc {
    background: white;
    margin: 20px auto;
    padding: 20px;
    width: 80%;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
}