Bubble title.

The main text for your bubble goes here. You can separate you text into multiple paragraphs

like this. You use any other html you want, such as hyperlinks to other sites, or emphasized text. I am using mathjax, so you can include inline math latex commands in the usual way $a + b = 2$, or you can use display math: $$\zeta(3) = (1 - \pi) / \sqrt(2)$$