Popup gets cut in some places

![image](https://user-images.githubusercontent.com/35117769/231306360-a6900aa5-70ba-4c25-8e4c-d65b9ce7d08f.png)

I tested that adding `appendTo: document.body,` to tippy params in `biblePreviewer.js` makes it work; that was one of the suggestions in [Tippy FAQS](https://atomiks.github.io/tippyjs/v6/faq/#my-tooltip-appears-cut-off-or-is-not-showing-at-all)