See also https://community.contao.org/de/showthread.php?74780-4-4-38-bundle-2-1-1-Grid-als-Modul-schlie%C3%9Ft-ein-div-nicht https://github.com/contao-bootstrap/grid/blob/6e41d00822afa52eac46eb20fb49ce4abcdc199b/src/Resources/contao/templates/modules/mod_bs_grid.html5#L8
