.dropdown-menu li {
    position: relative;
}

.dropdown-menu .dropdown-submenu {
    display: none;
    position: absolute;
    left: 100%;
    top: -7px;
    z-index: 1000;
    display: none;
    min-width: 10rem;
    padding: 0.5rem 0;
    margin: 0;
    font-size: 1rem;
    color: #696e77;
    text-align: left;
    list-style: none;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid rgba(0, 0, 0, 0.15);
    border-radius: 10px;
}

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