Steps to reproduce: - Enter in edit mode. - Select the 'Header' menu. - Switch the default template to 'Rounded box menu'. - Select again the 'Header' menu and on the 'Navbar' details, update the format value (i.e: 10px) and save. -> Problem: some buttons are not affected by the change of the format value. The problem is that since [1], those buttons have the `rounded-circle` class so their font size is not the custom one (but it is the value of `$font-size-base` instead). To solve the problem, the css rule has been adapted in order to force the font size of the buttons inside the header to the custom value if it exists. [1]: https://github.com/odoo/odoo/commit/e3e9c492e0d1e009a0c459a1dc591e122b4b65d3 opw-3810794 closes odoo/odoo#158135 Signed-off-by: Romain Derie (rde) <rde@odoo.com>