After this commit: - The livechat button is redesigned as a floating icon in website. - The "colliding" check between buttons and bottom fixed elements is no longer done only on the buttons but also on the <a> elements. - When the livechat button hides a button/link, it is moved up rather than made invisible. task-2614762 closes odoo/odoo#78891 Signed-off-by: Romain Derie (rde) <rde@odoo.com>