Best way to have global css in Vuejs : <p>What is the best way to have a global css file in Vuejs for all components? (Default css like bg color, button styling, etc)</p>

<ul>
<li>import a css file in the index.html</li>
<li>do @import in main component</li>
<li>put all the css in the main component (but that would be a huge file)</li>
</ul>
