Clashes with "page" css classes

[nircelero]

Hey @leonatherton.
Thanks for the awesome work you are doing with this package.

Just wanted to share that we ran into clashes with classnames when using idrviewer in our project, mostly due to the .page classname selector, as it is fairly commonly used elsewhere.

Thought I will share that in case it useful to others.

We took the approach of renaming .page to .idrviewer-page. You can checkout the code in the following fork:
master...Celero-io:idrviewer-fork:master