title: bootstrap-vue: import specific css
body: <p>I want to use a tooltip from the bootstrap-vue.
  When I add</p>
  <pre><code>import 'bootstrap/dist/css/bootstrap.css'
  import 'bootstrap-vue/dist/bootstrap-vue.css'
  </code></pre>
  <p>to get the tooltip style,
  then the whole view of my application is changing. Is it possible to import css only to my tooltip?</p>