As the "Big Box" snippet contain two divs that have a background it is invisible to change the background of the "Big Box" Instead of choosing a background for the "Big Box", choose a background for it's child divs. Task-2678999 Forward-port-of: #81064 X-original-commit: e495544722a5d96f390d84452d0c84869a34391c Part-of: odoo/odoo#90394