Polymer.js browser compatibility - Can't see CSS in Firefox and Safari - html

Hi I'm new in using Polymer.js and I'm building my HTML custom tags in order to reuse them in my front-end work. The problem is that when I try to open my index.html in Safari and Firefox I see the only HTML without all the CSS. In Chrome everything works perfectly. I can't understand why it happens.
I use Polymer 1.0.0 and Firefox and Safari are in their latest versions.
Any suggestions?
Thank you all in advance.
Here is the code (As you notice I've included the webcomponents-lite.min.js):
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="mobile-web-app-capable" content="yes">
<title>Polymer Project</title>
<script src="../../bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
<link rel="import" href="app/components/pd-dashboard/dashboard-articles.html" />
<div class="row">
<dashboard-articles> </dashboard-articles>
</div>
<div class="col-sm-2"></div>
</div>
</html>
dashboard-articles.html:
<link rel="import" href="../../../bower_components/polymer/polymer.html">
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<link rel="import" href="../../components/articles/article-2col/article-2col.html">
<link rel="import" href="../../components/articles/article-1col/article-1col.html">
<link rel="stylesheet" type="css/text" href="../../components/pd-dashboard/dashboard-articles.css" />
<!-- Fonts -->
<link href='https://fonts.googleapis.com/css?family=Dosis:800,600,700' rel='stylesheet' type='text/css'>
<link href='https://fonts.googleapis.com/css?family=Nunito:400,700' rel='stylesheet' type='text/css'>
<script src="../../bower_components/webcomponentsjs/webcomponents-lite.min.js"></script>
<dom-module id="dashboard-articles">
<template>
<div class="container-fluid">
<div class="row" style="margin: 5px">
</div>
<div class="row">
<hr>
<div class="row">
<div class="col-sm-5">
<article-1col></article-1col>
</div>
<div class="col-sm-7">
</div>
</div>
</div>
</template>
</dom-module>
<script>
Polymer({
is: "dashboard-articles"
});
</script>

Problem solved!
The <link> to the .css file must be inside the tag <template> in each component you create!

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