#masthead .container {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
}
#masthead .logo {
    float: left !important;
}
#masthead .main-navigation {
    float: right !important;
}
/* Force le bandeau noir et tout son contenu à se centrer sur la page */
#masthead {
    width: 100% !important;
    display: flex !important;
    justify-content: center !important;
}

#masthead .container {
    width: 100% !important;
    max-width: 1080px !important;
    margin: 0 auto !important;
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    float: none !important;
}