Lectora Inspire: Simple Modern Buttons
You’ve probably noticed that modern websites often use simple, frame-only buttons over full-screen graphics (or even videos). It’s easy to use the same design in your course, too! Simply set the fill to transparent, set the button border to white 3px, choose a modern font (Open Sans is a great free modern font) and you’re ready to go.
For the hover state, simply invert the colors by setting the fill to solid white and text to black.
Source: Trivantis Community, Sergey Snegirev