I-beam cursor in book signing screen has wrong color

In the book signing screen, the I-beam cursor for the title field (the one that appears when it lies in the middle of the text) is too light.

Reproduction

1. Get a Book and Quill

2. Press “Sign”

3. Insert some text in the title field

4. Move the insertion cursor to the left

Expected behavior: The cursor is black.

Actual behavior: The cursor is light gray.

Code analysis (1.21.8, Yarn 1.21.8+build.1)

In TextFieldWidget#renderWidget, the call to DrawContext#fill that draws the I-beam has the color hardcoded to 0xFFD0D0D0.