No button icons and exit-fullscreen button not working

I'm having multiple issues with the plugin, which could be related. I installed from GitHub directly ("leaflet-fullscreen": "git://github.com/runette/Leaflet.fullscreen.git" in package.json). This is what I see when displaying a map:

The icon in the fullscreen button is missing. When I click the button, the map is displayed in fullscreen as expected. There is still no icon in the button.

When I click the button again in fullscreen mode, nothing happens (it should exit fullscreen, I would expect).

There are no messages in the console.

Am I doing something wrong? Is the plugin broken? Thanks!

Maybe related to Leaflet#121

I solved part of it - apparently I had to explicitly import the CSS file. The exit-fullscreen issue seems to be caused by the plugin not realizing that it is in fullscreen, as the button icon does not change when going fullscreen. When I use pseudo-fullscreen instead, it does work. However that is suboptimal, and the escape button does not seem to work in that mode.

[KristjanESPERANTO]

Can you show your problem at codepen or something similar?