I’ve tried adding font:0.9em/1.3 even font:0.9em/3 to .ebk p, but all browsers ignore it, and FF alone shows a small space between lines. All other browsers squash the lines closely together.
I seems you’ve made the changes suggested by conradical, and it seems to be working for me. But you haven’t set a specific line height now, which you can do it you want: