Those were broken by the theme update for 17.0, in particular at [1]. Indeed the underline colors were defined using `text-XXX` classes to use the theme colors, relying on the fact that the default color of HR elements used the `currentColor`. Now they use the `currentColor` but very faded... making those underline colors uglier and for one of them, basically invisible. As a stable fix, this updates the XML to make the border use the `currentColor` as before in new mega menus... although they do not work as well in 17.0 as they did in 16.0. This will be reviewed in master to use better colors and a more reliable and beautiful way. [1]: https://github.com/odoo/odoo/commit/fad514ebdc25b9de03fd387a0c07dbbc274c364e closes odoo/odoo#163011 Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>