polymer 1.0 : how to store repetitive <style></style> section in another file?
<p>I have a few dom-modules all of which share some style lines in their style sections. So, I want to store those lines in the style section into another file and load in into my other elements. Any comment will be appreciated.</p>

<p>I know there is a style section in the polymer website, but it's too difficult to those without css background.</p>

<p>Thank you in advance.</p>