.dropdown-menu {
    margin-top: 0;
}
.dropdown-menu .dropdown-toggle::after {
    vertical-align: middle;
    border-left: 4px solid;
    border-bottom: 4px solid transparent;
    border-top: 4px solid transparent;
}
.dropdown-menu .dropdown .dropdown-menu {
    left: 100%;
    top: 0%;
}