Published on Dec 10, 2019Drop-down Menu in OxygenSridhar Katakam This members-only tutorial provides the steps to implement the Drop-down menu by Ivan Grozdic in Oxygen. Live Demo Step 1 a) We need nav__list-item class to be present for the nav menu list items. This can be set up using nav_menu_css_class filter in WordPress. Install and activate Code Snippets plugin. Go to Snippets > Add New. Title: Add "add_li_class" option to nav menu items Code: This is a premium members-only content. To view the rest of the content, please sign up for membership ($47/month or $599 one-time). Already a member? Log in below or here. Username Password Remember Me Forgot Password