When I create an event in the Thunderbird calendar and enter text in the “Details” field, the text appears the same color as the black background, making it unreadable.

When I create an event in the Thunderbird calendar and enter text in the “Details” field, the text appears the same color as the black background, making it unreadable, as shown in the attached image. However, red and blue text displays normally. It seems there is no option to specify font colors in the calendar. I would appreciate it if you could suggest a solution. Thank you in advance.