Injecting CSS into the layout from within a zf2 module

Question

I'm almost done writing a very simple module for zf2. One thing I'd like my module to do is to inject some css to the layout so that the HTML it generates displays in a nicer way.

Is this possible to do from within a module? If so, how?

EDIT: Thank you all for the prompt responses. However I think I probably didn't explain myself very clearly. When I say "inject some css" I mean taking a string of css and having it actually rendered INSIDE the layout. I didn't mean linking to an external css file or having an asset manager publish my files like the answers so far have suggested.

Answer 1

See Publishing assets from modules in Zend Framework 2 or How to merge Zend Framework 2 module public directories for discussion of the options you have for pushing public assets from a module.

And in addition to pushing your module assets to public, you could put the append into a triggered method like onBootstrap:

public function onBootstrap($e) {
    $sm = $e->getApplication()->getServiceManager();
    $headLink = $sm->get('viewhelpermanager')->get('headLink');
    $headLink->appendStylesheet('/assets/MyModule/css/mystylesheet.css');
}