woocommerce/plugins/woocommerce-admin/client/components/calendar/style.scss

/** @format */

.woocommerce-calendar {
	.DayPicker {
		margin: 0 auto;
	}

	.CalendarMonth_table {
		margin-top: 10px;
	}

	&.is-mobile {
		height: 360px;

		.DayPicker {
			width: 318px;
		}
	}
}