This issue only occurs on Firefox because ´has´ is not supported and the following rule is not applied: https://github.com/odoo/odoo/commit/2cd0106e63785dd34553c2b4747d72b93b9a7afd Anyway, there is an existing css rule that is applied if the field class is correclty added. Steps to reproduce: - Open Sale - Add some content in the sale order line opw-3201461 opw-3285854 opw-3266130 opw-3244581 closes odoo/odoo#121979 X-original-commit: add1df806157c074fd1a3224d1d8bdf1922481fb Signed-off-by: Pierre Paridans (app) <app@odoo.com>