Add a margin bottom on snippet buttons. So when there are 2 buttons (or more) on the same line, we have a space between them on small devices when displayed vertically. task-2327741 closes odoo/odoo#61484 X-original-commit: 9db7b9bdbd86405fdfe2c0efccebea780b7ffb63 Related: odoo/design-themes#422 Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>