Scrolling is now fixed! And just updated so that if you click outside modal it closes. Working on update now so you can edit text you've already added.

Agree with you regarding fonts, bolding underlining etc. and having instant page deletion with undo/redo. Will definitely be adding soon.

Fixed the arrow closing the preview pane so that the page stays centered.

I plan on adding a lot more features so that it's on par with ilovepdf.com and smallpdf.com. The libraries I'm already using support many of the features they have, so it'll be easy to add them while keeping everything fully in the browser.

Thanks for the feedback!