Styleguide CSS has a CSS reset and modifies <body>
see https://github.com/devnacho/mountain_view/blob/master/app/assets/stylesheets/mountain_view/styleguide.css#L10 and https://github.com/devnacho/mountain_view/blob/master/app/assets/stylesheets/mountain_view/styleguide.css#L8
<body> is not really an issue, but i think the styleguide generated by mountain view should use the same unmodified styles as the app - hence everything in the styleguide's CSS (which styles the styleguides navigation bar and meta information) should be encapsulated in classes that are unlikely to clash with anything from my app. one could debate whether the current naming convention for styleguide elements using mv-... is safe enough.
the CSS reset is especially problematic since it targets plain HTML tags. unless i'm using the same reset (Eric Meyer's v 2) in my app, i might get different looking elements in the styleguide than in the app.
I also have this issue. How can I help solve it?
The easiest way to currently work around it is to add your own app/views/layouts/mountain_view.html.erb (in your app) that will override the gem one. It should give you way more flexibility.
#38 gives an alternative solution to this, but it has conflicts and can't be merged right now. Any feedback regarding those changes is welcomed!