body {
    margin: 0px ;
    padding: 10px;
    
}

.dropdown-submenu {
    position: relative;
}

.dropdown-submenu .dropdown-menu {
    top: 0;
    left: 100%;
    margin-top: -6px;
    margin-left: 0;
    border-radius: 0.25rem;
    display: none;
}

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

.dropdown-menu.show {
    display: block;
}