body {
    margin: 0;
    padding: 20px;
    background: #5997ce;
    text-align: center;
    font-family: "Trebuchet MS", Verdana, Arial;
    font-size: 20px;
    font-weight: 700;
}

div#conteneur {
    width: 80%;
    max-width: 550px;
    margin: 0 auto;
    text-align: center;
    background: #283979;
    padding: 20px;
    border: 5px solid #d54044;
}

div#conteneur2 {
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    text-align: center;
    background: #FFFFFF;
    padding: 20px;
}

img.responsive {
    max-width: 100%;
    height: auto;
}

/* Styles pour les petits écrans */
@media (max-width: 600px) {
    body {
        font-size: 14px;
        padding: 10px;
    }
    div#conteneur, div#conteneur2 {
        width: 100%;
        padding: 10px;
    }
    div#conteneur {
        border-width: 3px;
    }
}

@media (max-width: 400px) {
    body {
        font-size: 12px;
    }
}