Recently I had just participated in Codeforces Round #654 (Div. 2). I submitted a solution for D at the last second (1:59:59) but it said "Contest is over" because the submit button has a 1-2 second delay. @MikeMirzayanov can you please add some functionality to have a small 1-2 second grace period after the contest is over for people who submit at the last second? I know I still have to get better but for some I think this would be very beneficial.