 called <code>ember-tutorial.css</code> and putting that file in the super-rentals <code>vendor</code> directory.
As Ember CLI runs, it takes the <code>ember-tutorial</code> CSS file and puts it in <code>vendor.css</code> (which is referenced in <code>app/index.html</code>).
We can make additional style tweaks to <code>vendor/ember-tutorial.css</code>, and the changes will take effect whenever we restart the app.</p>
<p>Run the following command to install the addon:</p>
<pre class="language-bash line-numbe