WordPress/wp-includes/blocks/calendar/style.min.css

.wp-block-calendar{text-align:center}.wp-block-calendar tbody td,.wp-block-calendar th{border:1px solid #ddd;padding:.25em}.wp-block-calendar tfoot td{border:none}.wp-block-calendar table{border-collapse:collapse;width:100%}.wp-block-calendar table th{background:#ddd;font-weight:400}.wp-block-calendar a{text-decoration:underline}.wp-block-calendar table caption,.wp-block-calendar table tbody{color:#40464d}