After countless hours of troubleshooting, I am still unable to pinpoint the source of the border on the horizontal menu items in my website, which is built on WordPress using a child theme called Required+ (based on Zurb's Foundation). I have tried setting the border, background, padding, and margin to none, transparent, and 0 for both the main element and its children, but the annoying border persists between all menu items. Despite inspecting the CSS with Chrome's developer tools for hours, I have yet to find any leftover border settings. It seems that everything that could have been set by the parent theme has already been overridden. If anyone has any insight or suggestions, I would greatly appreciate it. Thank you!