Custom CSS to fix menu issue

Need some custom CSS to address this issue when viewing the site on large screen. The dropdown menus go a bit off on one side of their parent menu. And the menu items container height is kind of uneven at the bottom.

https://static.livechatinc.com/8801096/P5KAFQMNML/e1afc0f480d403084af78823e3012e7c/cjcmenu.jpg