title: Mime type error when Importing CSS in Stackblitz
body: <p>I would include material design in my Angular project. I'm using Stackblitz online IDE.</p>
  
  <p>The problem is when I include css file I get this error </p>
  
  <pre><code>The stylesheet was not loaded because its MIME type, ”text/html“ is not ”text/css"
  </code></pre>
  
  <p>Here's my code in index.html: </p>
  
  <pre><code>&lt;link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/foundation/6.3.1/css/foundation.min.css"&gt;
  &lt;head&gt;
  &lt;link rel="stylesheet" type="text/css" href="styles.css"&gt;
  &lt;link "href=node_modules/@angular/material/prebuilt-themes/indigo-pink.css" rel="stylesheet"&gt;
  &lt;/head&gt; 
  &lt;my-app&gt;loading&lt;/my-app&gt;
  </code></pre>
  
  <p>and styles.css : </p>
  
  <pre><code>body {
  background:#e8e8e8;
  font-family: 'Muli';
  </code></pre>
  
  <p>}</p>