Text with changing margins not rendered correctly

[pssandhu]

In Chapter 3 of Alice's Adventures in Wonderland by Lewis Carroll there is a poem written in a wavy/spiral shape with decreasing text size. I'm using this Project Gutenburg ebook which changes the margin for each line to get the effect but it is not rendered correctly in Libera.

I am only using the document styles and no custom css. Settings like text alignment have no effect.

Result:

Expected Result: