The page richtext.html is used to check all styles into the rich field when the user is editiing a rich content into the CMS. It should be stricktly the same than the styles into the page-interieure.html

It seems that the .mceBodyContent class is missing in the richtext.html

Then, the richtext-boeditor.html it shoud be used only the check the styles of titles and paragraph availables in the dropdown of the CMS