div#mobile-menu ul.accordion-menu li:nth-child(6),
div#mobile-menu ul.accordion-menu li:nth-child(7),
div#mobile-menu ul.accordion-menu li:nth-child(8) {
  text-transform: uppercase;
}

div#mobile-menu ul.accordion-menu > li:nth-child(6),
div#mobile-menu ul.accordion-menu > li:nth-child(7),
div#mobile-menu ul.accordion-menu > li:nth-child(8),
div#mobile-menu ul.accordion-menu > li:nth-child(9) {
  text-transform: lowercase;
}