.mod-menu .nav-child {
    display: none;
    position: absolute;
    background: #fff;
    min-width: 200px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    z-index: 1000;
}
.mod-menu li:hover > .nav-child,
.mod-menu li.parent:hover > .nav-child {
    display: block;
}
.mod-menu .nav > li {
    position: relative;
}