li.submenu-item {
    padding-left: .9em;
    position: relative;
    list-style: none;

}

li.submenu-item::before {
    content: "›"; /* atau gunakan ▶, →, ⮞ */
    position: absolute;
    left: .8em;
    top: 18%;
    color: #1091ff;
}
li.submenu-item>a {
    color: #6c757d !important;
}