When editing a Page Builder, the Rich text inside a Text block is unconfortable to use in certain cases. Sometimes, impossible to use. When you click on align right on the toolbar inside the Text Block, the toolbar aligns itself to the right as well. But the toolbar collapses and a part of it is hidden. Also a scrollbar appears on the bottom of the window, but impossible to scroll.

Steps to reproduce:

1. Install a clean version of Ibexa V.3.3
2. Edit a landing page
3. Add a text bloc inside the landing page(drag and drop)
4. click on the content block of the Text Block and see the toolbar appears
5. click on align right button
6. You will notice that a part of the toolbar is missing and the window has a scrollbar on its bottom. Try to use that scrollbar. You may not.