.yy-sub-menu {
    display: none;
}

.yy-has-sub.yy-sub-open > .yy-sub-menu {
    display: block;
}

@media (max-width: 960px) {
    .yy-toggle {
        display: block;
    }

    .yy-nav {
        display: none;
    }

    .yy-nav-open .yy-nav {
        display: block;
    }
}