[filippo]

Does it work with any kind of theme?

[widgetic]

Indeed, it does. The widgets are completely responsive as you can see here: https://www.facebook.com/widgetic/videos/vb.311160592370762/...

For those that prefer to embed a specific one in unspecific ways, we provide an API for that http://docs.widgetic.com/#building-a-custom-editor. But it's only for developers.