Bug Report
When using coverpage with a theme color, the second link become invisible when hovered
Steps to reproduce
- Add a cover page
- Set a themeColor (e.g. #ff6600)

What is current behaviour
The second button (Getting Started on docsify.js.org) take the color of the theme when hovering. As the background color of this button is also themeColor, it result in an invisible link.
What is the expected behaviour
Link should be visible when hovered