:root {
    --bleu: #0033A0;
}

body {
    font-family: 'Open Sans', sans-serif;
    margin: 0;
    padding: 0;
    color: #333;
}

header {
    background-color: white;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: var(--bleu);
    font-size: 1.5rem;
    font-weight: bold;
}

.hero {
    background-color: #f8f9fa;
    padding: 3rem;
    text-align: center;
}

.btn {
    background-color: var(--bleu);
    color: white;
    padding: 0.5rem 1rem;
    text-decoration: none;
    border-radius: 4px;
}

footer {
    background-color: #f8f9fa;
    padding: 1rem;
    text-align: center;
}