/* Nested Drowpdown Menu */
.dropdown-submenu {
    position: relative;
}

.dropdown-submenu>.dropdown-menu {
    top: 0;
    left: 100%;
    margin-left: 0.1rem;
    margin-top: -0.5rem;
    display: none;
}

.dropdown-submenu:hover>.dropdown-menu {
    display: block;
}