Try the rounded corners, looks nice:
╭────────────────────╮
│ October 2021 │
├──┬──┬──┬──┬──┬──┬──┤
│Su│Mo│Tu│We│Th│Fr│Sa│
├──┼──┼──╔══╗──┼──┼──┤
│10│11│12║13║14│15│16│
├──┼──┼──╚══╝──┼──┼──┤
│24│25│26│27│28│29│30│
╰──┴──┴──┴──┴──┴──┴──╯