ember application template classname

I'm having a similar problem to this one:

Setting tagName on application template in ember js

While I agree that falling back to a legacy view addon can't be the way to go, here too my bootstrap-based CSS is broken by the enclosing div (the height being not set, to be precise).

Now a different way to achieve what I need is to set the enclosing div's classNames property (if it exists), like it can be done with a component:

export default Ember.Component.extend({
    classNames: ['container']
});

Thus I could apply height:100%, and everything would be fine.

Can it be done? Thanks!