Before this commit, calendar view's height was 89.5% of its container. It was because of hr_holidays module which reduces the calendar's height to add some elements on top of it. This commit adds a class `o_timeoff_calendar` on calendar view's controller to scope css rules only in the hr_holidays module and set the height to a fixed value. Task id: 2193921 closes odoo/odoo#54268 Related: odoo/enterprise#12183 Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>