body { 
    font-family: 'Segoe UI', Arial, sans-serif; 
    margin: 0; 
    padding: 20px; 
    text-align: center; 
    background: #f4f4f4; 
}

h1 { color: #007bff; }

section { 
    background: white; 
    padding: 30px; 
    border-radius: 10px; 
    box-shadow: 0 4px 15px rgba(0,0,0,0.1); /* Correction ici */
    max-width: 800px; 
    margin: 20px auto; /* Centre la section */
}

nav {
    background: #333;
    padding: 10px;
    margin-bottom: 20px;
}

nav h1 { color: white; margin: 0; }