/* Supprimer la marge du header */
#site-header,
#main-menu {
  margin: 0 !important;
  padding-top: 0 !important;
  padding-bottom: 0 !important;
}

/* Optionnel : harmoniser le fond */
header#site-header {
  background: linear-gradient(to bottom, #0c0c14, #0c0c14);
  border: none;
}