I use grid elements here: https://kontento.de/projekte-item/lead-gen-beispiel-instituto-cervantes/
But on tablets the image does not cover the whole background – any ideas?
Thank you for the update.
You could edit the grid row cell and set the “Background Repeat” to “Stretch to fit”. That will cause the image to cover the whole container, but it may get cut off a bit on the edges or overflow outside the background positioning area.