Contrast not enough for buttons

[panda2134]

Currently each button has a rainbow background and white text in celebration of pride month. However, this might cause a lack of contrast, as shown below, causing troubles for the visually impaired people. In the greyscale version, you can see that the "n" and "l" letters in the word "download" can hardly be seen.

Therefore, I suggest reducing the brightness of the background to resolve the problem. Another possible approach is adding outline to the text.