Button border missing for default dark button in dark mode?

Describe the bug
In https://flowbite.com/docs/components/buttons/#default-button
When I switch to dark mode, the background of the third button (dark style) is very close to the dark background.
I can see that the border is set to "dark:border-gray-700", but the border is not shown because the class name "border" is missing.

Is this on purpose or is it a style mistake?

To Reproduce
Steps to reproduce the behavior:

1. Go to https://flowbite.com/docs/components/buttons/#default-button
2. Click on 'Toogle dark mode'

Expected behavior
I expected the dark style button's border looks like this:

The same goes for the "Dark style" button in https://flowbite.com/docs/components/buttons/#button-pills

Screenshots
See above

Desktop (please complete the following information):

• OS: Windows 10
• Chrome
• Version 120.0.6099.225

Start with the Default button example at the Flowbite buttons documentation URL in the issue, then check the Button pills example for the same Dark style button. Inspect the classes used by both examples and verify the fix by toggling dark mode; done means the dark style borders are visibly rendered against the dark background.