The goal of this commit is to prevent the theme install/update loader from inheriting the opacity property from container by setting a background-color with level of transparency. task-2312878 closes odoo/odoo#59887 X-original-commit: 1e7424579ba7b59c9bc7a4972b10403610f720cb Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>