I use Firefox v70 on Windows 10. If I create a new Confluence Cloud Wiki page, the page will not render correctly after I save it. The text is not aligned as expected along the left margin, instead it displays indented a good distance from the left margin.
The page I created renders better on Chrome or Edge on my computer, but the font seems too big even there. However, older pages I have created weeks ago still render fine in my Firefox, it's only new pages that display strangely.
Someone else on Chrome created a new Confluence Cloud Wiki page and it rendered correctly in their Chrome. But it did not render correctly in my Firefox.