/* Submenu layout */
.dropdown-submenu {
    position: relative;
}

.dropdown-submenu > .dropdown-menu {
    top: 0;
    left: 100%;
    margin-top: -1px;
    display: none;
    position: absolute;
    z-index: 1000;
    min-width: 250px;
}

/* Show on hover */
.dropdown-submenu:hover > .dropdown-menu {
    display: block;
}